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question_answer1) What is the charge and mass of a neutron?
question_answer2) Which sub-atomic particles of an atom are responsible for atomic mass?
question_answer3) Why did Rutherford select a gold foil in his a-ray scattering experiment?
question_answer4) What are isotopes?
question_answer5) In the notation of nitrogen what do the numbers 14 and 7 denote?
question_answer6) Atomic number of an element is 12. What is its valency?
question_answer7) The atomic number of neon is 10. Write its electronic configuration.
question_answer8) Identify the pair of isotopes from the following
question_answer9) What is the atomic number of the element X, which has 2 shells, K and L having 2 and 6 electrons respectively?
question_answer10) Who discovered neutron?
question_answer11) An atom of an element is represented as . How many electrons and neutrons are present in this atom?
question_answer12) What is the difference between Na and in terms of number of electrons?
question_answer13) If has 12 protons and 12 neutrons, what is its atomic number and mass number?
question_answer14) The atom of an element has 9 protons, 10 neutrons and 9 electrons. Mention its atomic number and mass number.
question_answer15) Write the mass number of neon and argon from the data given below. Elements Number of protons Number of neutrons Neon 10 10 Argon 18 22
question_answer16) What happens to an element ' Z' if its atom gains 3 electrons?
question_answer17) If contains 18 electrons, what is its atomic number?
question_answer18) Name the particles which are present in the extra nuclear part of the atom.
question_answer19) Name an element which does not contain neutron.
question_answer20) What name is given to the particle of anode rays obtained using hydrogen gas in the discharge tube?
question_answer21) What are cathode rays?
question_answer22) Which isotope is used to cure cancer?
question_answer23) Where are the valence electrons located in an atom?
question_answer24) What are canal rays?
question_answer25) What constitutes nucleus of an atom?
question_answer26) Write the symbol of an element having atomic number 18 and mass number 40.
question_answer27) Uranium-235 has 92 protons in its atom. Calculate the number of neutrons in this atom.
question_answer28) Which radioisotope is used to determine the age of old wooden objects?
question_answer29) What is the electronic distribution in an aluminium atom? [Given, atomic number of Al = 13]
question_answer30) Is it possible for the atom of an element to have 1 electron, 1 proton and no neutron. If so, name the element.
question_answer31) Calculate the number of neutrons present in the nucleus of an element X which is represented as .
question_answer32) What is the electronic configuration of (Rb (37)?
question_answer33) What is the electronic configuration of Ca(20)?
question_answer34) Which isotope of hydrogen contain same number of electrons, protons and neutrons?
question_answer35) What is the electronic configuration of ?
question_answer36) What would the element be if there are 2 valence electrons in its outermost M shell?
question_answer37) An atom has equal number of electrons and protons. Justify the statement.
question_answer38) Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order. Rutherford's atomic model, Thomson's atomic model, Bohr's atomic model.
question_answer39) Who gave the first model of an atom?
question_answer40) What -will-be, the-valency of an atom with 3 protons and 4 neutrons?
question_answer41) When particles are bombarded on a gold sheet, only a few of them got deflected whereas mostly go straight undetected? Give reasons.
question_answer42) What does Rutherford's particle scattering experiment shows?
question_answer43) What is the radius of nucleus?
question_answer44) For a neutral atom, what equals to the number of protons?
question_answer45) Which gas is filled in the discharge tube when the highest value of e/m of anode rays has been observed?
question_answer46) Which isotope is used in thyroid scan?
question_answer47) Give example of any two isobars.
question_answer48) What is the electronic distribution in the Mg atom?
question_answer49) The number of electrons in an element X is 15 and the number of neutrons is 16. Correctly represent the element.
question_answer50) The number electrons in the outermost shell of chlorine is 7. What is its valency and why?
question_answer51) In a sample of ethyl ethanoate the two oxygen atoms have the same number of electrons but different number of neutrons. Give correct reason for it.
question_answer52) Which isotope of carbon is isotonic to and is used in radiocarbon dating to determine the age of old samples of living organisms?
question_answer53) What is then n/p ratio of Ra?
question_answer54) What is the n/p ratio of V?
question_answer55) The atomic number of calcium and argon are 20 and 18 respectively but the mass number of both these elements is 40. What is the name given to such a pair of elements?
question_answer56) One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?
question_answer57) In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?
question_answer58) Write any two observations which support the fact that atoms are divisible.
question_answer59) Will and have different valencies? Justify your answer.
question_answer60) Write the drawbacks of Rutherford's model of an atom.
question_answer61) The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
question_answer62) An atom of an element has two electrons in the K shell, four electrons in L shell. What is the atomic number of the element? Identify the element.
question_answer63) In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer.
question_answer64) Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.
question_answer65) An element X has a mass number 4 and atomic number 2. Write the valency of this element.
question_answer66) Atomic number of aluminium is 13 and mass number is 27. Calculate the number of electrons, protons and neutrons in its atom. Represent the ion of this element.
question_answer67) Number of protons, neutrons and electrons in the four specimen A, 5, C and D are respectively 6, 6, 6; 7, 7, 7; 6,8, 6; and 9,10, 10. Which of them are (a)Isotopes (b)Isobars? Why?
question_answer68) Write one pair of isobars. Why the chemical properties of isobars are not similar?
question_answer69) Write down the electron distribution of chlorine atom. How many electrons are there in the L shell? Atomic number of chlorine is 17
question_answer70) For the symbols He4 and He5 tabulate the two sub-atomic particles, present in the nucleus of each of them.
question_answer71) Find the electron distribution for the element which has atomic number 17 and write its valency.
question_answer72) The number of electrons in the outermost shell of an element is 5. What is its valency and why?
question_answer73) In the following table, the mass number and the atomic number of certain elements are given. Elements A B C D E Mass number 1 7 14 40 40 Atomic number 1 3 7 18 20 (a) How many neutrons are present in B and D? (b) What would be the valency of element 'B' listed in the above table?
question_answer74) Which of the two would be chemically more reactive: element 'A' with atomic number 18 or element 'D' with atomic number 16 and why?
question_answer75) Why are electrons known as planetary electrons?
question_answer76) What are scintillations?
question_answer77) Give the electronic configuration of silicon and phosphorus. [Given, atomic number of Si =14, P =15]
question_answer78) Determine the valency of oxygen and sulphur.
question_answer79) The atom of an element has 9 protons, 9 electrons and 10 neutrons. (a) What is the atomic number of the element? (b) Predict the valency of the element.
question_answer80) Composition of the nuclei of two atomic species A and B are given below A B Protons 17 17 Neutrons 18 20 (a) What are the mass numbers A and B? (b) How are they related to each other? Define the term.
question_answer81) What is the colour of electron, proton and neutron? Give explanation.
question_answer82) The cation of an element X is represented by . Its atomic number is less than 20. Show the distribution of electrons amongst different orbits of this element. What could this element be?
question_answer83) Why is atomic mass of chlorine taken as 35.5 u and not a whole number like 35 u or 3 6 u? Explain.
question_answer84) Three different atoms of oxygen are represented as and (i) What do the subscripts (lower figures) and superscripts (upper figures) represent? (ii) What factor is responsible for the change in the subscripts, 16, 17 and 18, though the element is the same?
question_answer85) An atom of an element has two electrons in the outermost M shell. State (a) electronic configuration (b) atomic number (c) number of protons (d) valency of this element
question_answer86) State the three rules proposed by Bohr and Bury, regarding distribution of electrons in different orbits of atom.
question_answer87) Why do helium, neon and argon have a zero valency? Explain.
question_answer88) (a) Chlorine occurs in nature in two isotopic forms with masses 35 u and 37 u. The percentage of is 75%. Find the average atomic mass of chlorine atom. (b) Give any three applications of isotopes.
question_answer89) (a) What was Thomson's model of an atom? (b) Write any two observations of Rutherford's model of an atom.
question_answer90) Elements from A to F have the distribution of electrons, protons and neutrons in the following way. Atom/Ion Number of electrons Number of protons Number of neutrons A B C D E F 4 10 17 17 18 19 3 11 17 17 18 19 4 12 18 20 22 21 From the table, find (a) a pair of ions (b) an atom of noble gas (c) a pair of isobars (d) a pair of isotopes
question_answer91) An old man and a scientist were talking about a deserted house. The old man was sure that it was haunted by ghosts, but the scientist discarded the view saying no one had ever seen a ghost. The old man was annoyed and challenged the scientist about existence of atoms, sub-atomic particles which also could not be seen. Read the given passage and answer the following questions (a) Name the three sub-atomic particles and their discoverers. (b) Whose viewpoint do you support and why?
question_answer92) Suman was not looking happy and was unable to focus on studies. Her friend Reena observed the same and inquired Suman. Suman told Reena that her younger sister is not keeping good health. Her neck has swollen. The reason came to light was that, Simian's family was not taking iodised salt in their diet. Reena suggested certain measures and insisted that Suman's sister must see the doctor immediately. Read the above passage and answer the following questions (a) What can be possibly the disease from which Suman's sister was suffering? (b) Name the element whose isotope is used in the treatment of this disease. (c) What are the values which are shown by Reena?
question_answer93) (a) Boron atom has atomic mass of 11u and has 5 protons in its nucleus. How many neutrons does it have? (b) What are the number of valence electrons in this atom, and its ion?
question_answer94) (a) What is the number of electrons in ion? (Cl =17) (b) What is the electronic configuration of phosphorus? (P = 15) (c) Which isotope of uranium is used in nuclear fuel?
question_answer95) Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.
question_answer96) An ion M3- contains 10 electrons and 7 neutrons. What is the atomic number and mass number of the element M? Name the element.
question_answer97) (a) Write the name of an element whose atom has same number of sub-atomic particles. Draw the atomic structure of the atom. (b) Draw atomic structure of an atom with same number of electrons in L and M shells.
question_answer98) Given alongside is the atomic structure of an atom of element A, according to Bohr's model of atom. (i) What is wrong with this structure of atom? (ii) Draw a correct representation of this atom. (iii) Write the chemical formula of the chloride of this element.
question_answer99) (a) Where is the mass of atoms concentrated? (b) Name two elements with same number of protons and neutrons. (c) Draw the atomic structure of sodium atom.
question_answer100) Complete the following table. Element Atomic number Proton Electron Neutron Mass number A B C 17 14 9 17 14 9 18 14 19
question_answer101) Two elements are represented as and (a) Which of these elements will lose and gain electrons? (b) What is the number of electrons an atom loses, gains or shares called? (c) Write the electronic configurations of X And K
question_answer102) The ratio of the radii of hydrogen atom and its nucleus is . Assuming the atom and the nucleus to be spherical, (a) What will be the ratio of their sizes? (b) If atom is represented by planet earth m, estimate the size of the nucleus.
question_answer103) Study the data given below and answer the questions which follow: Particles Electrons Protons Neutrons A B C D 2 10 8 8 3 9 8 9 4 8 8 10 (a) Write the mass number and atomic number of particles A, 5, C, D. (b) Which particles represent a pair of isotopes? Explain.
question_answer104) (a) Identify that which of the following pairs are isotopes and which are isobars? Give reasons for your choice. (b) Do isobars also have identical chemical properties like isotopes? State reason.
question_answer105) The following data represents the distribution of electrons, protons and neutrons in atoms of four elements A, B, C, D Particles Electrons Protons Neutrons A B C D 10 11 12 13 10 12 12 14 10 11 12 13 Answer the following questions. (i)Write the electronic distribution in atoms of element A and D. (ii) Element A is an inert gas. Why? (iii) What is the valency of element C? [cbse 2012]
question_answer106) Sulphur dioxide is a colourless pungent smelling gas and is a major air pollutant, (i) Write the electronic configuration of its constituent elements 'sulphur and oxygen'. (Given, ) (ii) Write the valencies of sulphur and oxygen. (iii) Are sulphur and oxygen isotopes of same element? Explain your answer.
question_answer107) In the following table the mass numbers and 'the atomic numbers of certain elements are given. Element A B C D E Mass No. 1 7 14 40 40 At. No. 1 3 7 18 20 (i)Select a pair of isobars from the above table. (ii) What would be the valency of element C listed in the above table? (iii) Which two subatomic particles are equal in number in a neutral atom?
question_answer108) On the basis of the number of protons, neutrons and electrons in the samples given below identify (i) the cation (ii) the pair of isobars, and (iii) the pair of isotopes Element Protons Neutrons Electrons A 17 18 16 B 18 19 18 C 17 20 17 D 17 17 17 (i)Sample A has more protons than the electrons. Hence, it is a cation, (ii) Sample B and C have same mass number but different atomic numbers. Hence, they are a pair of isobars, (iii) Samples C and D have same atomic number but different mass numbers. Hence, they are a pair of isotopes,
question_answer109) You are given an element Find out (i) number of protons, electrons and neutrons in X. (ii) valency of X (iii) write the chemical formula of the compound formed when X reacts with (a) hydrogen (b) carbon
question_answer110) How can you justify that Cathode rays originate from the cathode whereas anode rays do not?
question_answer111) An element 'M' forms the compound when it reacts with hydrogen. Find the valency of element M. (b)Write the valency of chlorine and sulphur. (c)Name three isotopes of hydrogen. (a)Valency of M=3 because it combines with three atoms of hydrogen. (b)Valency of chlorine (Cl 2, 8, 7) = 8- 7 =1 Valency of sulphur (S 2, 8, 6) =8 -6 =2 (c) Protium, Decuterium,Tritium .
question_answer112) (a) State the three observations made by Rutherford on his a-particle scattering experiment. (b) Write the electronic configuration of an element whose mass number is 31 and atomic number is 15. What is its valency?
question_answer113) (a) An element X has an atomic number 12 and mass number 26. Draw a diagram showing the distribution of electrons in the orbits and the nuclear composition of the neutral atom of the element. What is the valency of the element and why? (b) If this element X combines with another element Y whose electronic configuration is 2, 8, 7, what will be the formula of the compound thus formed? State how did you arrive at this formula.
question_answer114) (a) Write two differences between isobars and isotopes. (b) Write uses of Co-60 and U-235.
question_answer115) (a) What is an octet? How do elements reach an octet? (b) Make a schematic atomic structure of magnesium and phosphorus. [Given number of protons of magnesium =12 and that of phosphorus = 15]
question_answer116) In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, of the particles were found to deflect at angles > 50°. If one mole of particles were bombarded on the gold foil, compute the number of particles that would deflect at angles less than 50°.
question_answer117) How are the electrons distributed in different orbits (Shells)?
question_answer118) Complete the following table. Atomic no. Mass no. Number of neutrons Number of protons Number of electrons Name of atomic species 3 - 4 - - - 11 23 - - - Sodium - 24 - 12 - - 16 32 - - - Sulphur - 1 0 1 - -
question_answer119) Give some characteristic features of anode rays.
question_answer120) Write down the electronic configuration of first 5 elements in the periodic table mentioning their energy levels.
question_answer121) (a) Which popular experiment is shown in the figure? (b) List three observations of this experiment. (c) State conclusions drawn from each observation of this experiment. (d) State the model of atom suggested on the basis of the above experiment.
question_answer122) Complete the following gaps in the given table. Elements Protons Electrons Neutrons Atomic number Mass number A - - 10 8 - B 15 - - - 31 C 1 - - - 3 D - 11 12 - -
question_answer123) Fill in the blanks Mass number Atomic number Number of protons Number of electrons Number of neutrons Electronic configuration Number of valence electrons K L M N - 12 6 - - - - - - - -
question_answer124) On the basis of Rutherford's model of an atom, which sub-atomic particle is present in the nucleus of an atom?
question_answer125) Draw a sketch of Bohr's model of an atom with three shells.
question_answer126) What are canal rays?
question_answer127) Which subatomic particle is absent in an ordinary hydrogen atom?
question_answer128) Name a nucleus which does not contain neutron.
question_answer129) Which has greater mass?a proton or an electron?
question_answer130) Is it possible for the atom of an element to have one electron, one proton and no neutron? If so, name the element.
question_answer131) If an atom contains one electron and one proton, will it carry any charge or not?
question_answer132) How many electrons are present in an ion of an element having 3 positive charges if mass number of the atom is 27 and the number of neutrons is 14?
question_answer133) Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?
question_answer134) Write the electronic configuration of an element whose atomic number is 12.
question_answer135) If K and L shell of an atom are full, then what would be the total number of electrons in the atom?
question_answer136) What do you understand by ground state of an atom?
question_answer137) What is the valency of sodium atom (atomic number 11)?
question_answer138) What is the maximum number of electrons which can be accommodated in 'N' shell?
question_answer139) Write the correct representation of an element 'X' which contains 15 electrons and sixteen neutrons.
question_answer140) What will be the valency of an atom if it contains 3 protons and 4 neutrons?
question_answer141) Calculate the number of neutrons present in the nucleus of an element 'X' which is represented as .
question_answer142) Which of the following pairs are isotopes? (i) (ii)
question_answer143) Out of elements and which is chemically more reactive and why?
question_answer144) One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?
question_answer145) In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?
question_answer146) Give two important application of radioactive isotopes.
question_answer147) Which isotope of hydrogen is present in heavy water?
question_answer148) On the basis of Thomson's model of an atom, explain how the atom is neutral as a whole.
question_answer149) List any three distinguishing features between the models of an atom proposed by J.J. Thomson and Ernest Rutherford.
question_answer150) What do you think would be the observation if the a-particle scattering experiment is carried out using a foil of a metal other than gold ?
question_answer151) What are the limitations of J.J. Thomson's model of the atom?
question_answer152) What are the limitations of Rutherford's model of the atom?
question_answer153) How do you know that nucleus is very small as compared to the size of atom?
question_answer154) Write two characteristics of the canal rays.
question_answer155) Compare the properties of electrons, protons and neutrons.
question_answer156) Write the distribution of electrons in carbon and sodium atoms.
question_answer157) Write the electronic configuration of a positively charged sodium ion . Atomic number of sodium is 11.
question_answer158) The electronic configuration of phosphorus atom is 2, 8, 5. Give the electronic configuration of P3- ion.
question_answer159) The atomic number of Al and Cl are 13 and 17, respectively. What will be the number of electrons in and ?
question_answer160) Write down the electron distribution of chlorine atom. How many electrons are there in the L shell? (Atomic number of chlorine is 17).
question_answer161) Na+ has completely filled K and L shells. Explain.
question_answer162) Define valence electrons. Which electrons of an atom are involved in the chemical bond formation with other atoms?
question_answer163) How will you find the valency of chlorine, sulphur and magnesium?
question_answer164) Predict the valency of the following elements (i) A (Atomic number 5) (ii) B (Atomic number 12) (iii) C (Atomic number 14) (iv) D (Atomic number 17)
question_answer165) Define valency by taking examples of silicon and oxygen.
question_answer166) Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.
question_answer167) If Z = 3, what would be the valency of the element? Also, name the element.
question_answer168) Find out the valency of the atoms represented by the Figs. (a) and (b)
question_answer169) Identify the ion from the following figures. What is the valency of sodium atom? Give reason.
question_answer170) If number of electrons in an atom is 8 and number of protons is also 8, then what is the atomic number of the atom and what is the charge on the atom?
question_answer171) For the symbol H, D and T, tabulate three sub-atomic particles found in each of them.
question_answer172) Write the electronic configuration of any one pair of isotopes and isobars.
question_answer173) If bromine atom is available in the form of, say, two isotopes (49.7%) and (50.3%), calculate the average atomic mass of bromine atom.
question_answer174) The average atomic mass of a sample of an element X is 16.2 u. What is the percentage of isotopes and in the sample?
question_answer175) Composition of the nuclei of two atomic species 'X' and 'Y' are given as under X Y Protons 6 6 Electrons 6 8 Give the mass numbers of X and Y. What is the relation between the two species?
question_answer176) An element 'X' contains 6 electrons in 'M' shell as valence electrons: (a) What is the atomic number of 'X'? (b) Identify whether 'X' is a metal or non-metal.
question_answer177) The atomic number of lithium is 3. Its mass number is 7. (a) How many protons and neutrons are present in a lithium atom? (b) Draw the diagram of a lithium atom.
question_answer178) In the atom of an element 'Z', 5 electrons are present in the outermost shell. It requires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed? Write the formula of the compound which will be formed when 'Z' reacts with Na atom.
question_answer179) is an isotope of noble gas, radon. How many protons, neutrons and electrons are there in one atom of this radon isotope?
question_answer180) What information do you get from the figures about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.
question_answer181) Calculate the number of neutrons present in the nucleus of an element X which is represented as .
question_answer182) Why do isotopes show similar chemical properties?
question_answer183) What are isotopes? Give one example.
question_answer184) What are isobars? Give one example.
question_answer185) (i) State the method of determining the valency of an element if its atomic number is given. (ii) Determine the valency of the following elements, the atomic numbers of which are given in parenthesis: Chlorine (17), Sulphur (16), Aluminium(13)
question_answer186) What is the gold foil experiment? Name the scientist who performed this experiment. Write the conclusions and shortcomings of Rutherford's model of atom.
question_answer187) In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, 1.00% of the particles were found to deflect at angles > 50°. If one mole of particles were bombarded on the gold foil, compute the number of particles that would deflect at angles less than 50°.
question_answer188) Summarise the rules for writing distribution of electrons in various shells for the first eighteen elements.
question_answer189) Why do helium, neon and argon have a zero valency?
question_answer190) The ratio of the radii of hydrogen atom and its nucleus is . Assuming the atom and the nucleus to be spherical, (i) what will be the ratio of their sizes? (ii) If atom is represented by planet Earth '' = 6.4 X 106 m. Estimate the size of the nucleus.
question_answer191) Show diagrammatically the electron distribution in a sodium atom and a sodium ion and also give their atomic number.
question_answer192) Explain with examples (i) Atomic number (ii) Mass number (Hi) Isotopes and (iv) Isobars. Give any two uses of isotopes.
question_answer193) The given figure depicts the atomic structure of an atom of an element 'X' Write the following information about the element 'X'. (a) Atomic number of 'X' (b) Atomic mass of 'X' (c) Valence electrons (d) Valency of 'X' (e) 'X' should be metal or non-metal.
question_answer194) One electron is present in the outermost shell of the atom of an element 'Z' (a) What will be the nature of this element? (b) What will be the value of charge of the ion formed, if this electron is removed from the outermost shell?
question_answer195) Composition of the nuclei of two atomic species 'X' and 'Y' are given below: X Y Protons 8 8 Neutrons 8 10 Give the mass number of 'X' and 'Y'. What is the relationship between the two species?
question_answer196) An atom 'M' of an element reacts with oxygen to form Calculate the valency of the element 'M'.
question_answer197) 4. Complete the following gaps in the given table: Elements Protons Electrons Neutrons Atomic Number Mass Number A - - 10 8 - B 15 - - - 31 C 1 - - - 3 D - 11 12 - -
question_answer198) Explain why chlorine, whether as the element or its compounds, always has relative atomic mass of about 35.6.
question_answer199) Justify the statement, Protons are constituents of all atoms'.
question_answer200) An element -X' has mass number 4 and atomic number 2. Write the valency of this element. Will it react with other atoms of different elements?
question_answer201) Fill in the blanks. Mass No. Atomic No. No. of protons No. of electrons No. of neutron Electronic configuration No. of valence electrons K L M N 12 6 - - - - - - - - 40 20 - - - - - - - -
question_answer202) 9. How many electrons will weigh 1 g?
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