9th Class Science Structure of the Atom Question Bank

done Structure of the Atom Total Questions - 50

• question_answer1)
  Which pair of substances given below are isotopes?
  A)
   \[_{6}^{12}C\]and\[_{6}^{14}C\]   done clear
  B)
   Carbon dioxide and carbon monoxide done clear
  C)
   Diamond and graphite done clear
  D)
   \[{{C}_{2}}{{H}_{4}}\]and\[{{C}_{3}}{{H}_{6}}\] done clear
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• question_answer2)
  Which valence shell electron arrangement is that of a metallic element?
  A)
  \[2,\,\,1\]                          done clear
  B)
         \[2,\,\,4\] done clear
  C)
  \[2,\,\,5\]                        done clear
  D)
         \[2,\,\,7\] done clear
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• question_answer3)
  An element \[X\] has two isotopes, which may be represented as \[^{238}X\] and\[^{235}X\]. How does \[^{238}X\] differ from\[^{235}X\]?
  A)
   \[^{238}X\]has \[3\] more protons and \[3\] more electrons than\[235\]. done clear
  B)
   \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. done clear
  C)
   \[^{238}X\] has \[3\] more neutrons, but the electrons or protons are same as\[235\].   done clear
  D)
   \[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. done clear
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• question_answer4)
  An atom of an element contains \[17\] protons, \[18\] neutrons and \[17\] electrons. Which of the following will be the atomic structure of another isotope of this element?
  A)

  Protons	Neutrons	Electrons
  17	20	17

    done clear
  B)

  Protons	Neutrons	Electrons
  17	18	16

  done clear
  C)

  Protons	Neutrons	Electrons
  18	18	17

  done clear
  D)

  Protons	Neutrons	Electrons
  20	18	17

  done clear
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• question_answer5)
  The diagram given below represents the atom of an element. Which symbol gives the above information?
  A)
  \[_{4}^{9}Be\]   done clear
  B)
                     \[_{4}^{9}F\] done clear
  C)
  \[_{4}^{9}B\]              done clear
  D)
         \[_{4}^{9}O\] done clear
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• question_answer6)
  What does an atom and an ion of the isotope of sodium \[_{11}^{22}Na\] both contain?
  A)
   \[11\] electrons   done clear
  B)
          \[12\] neutrons   done clear
  C)
   \[23\] protons    done clear
  D)
          \[23\] neutrons done clear
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• question_answer7)
  What can be deduced from the symbol\[_{2}^{4}He\]?
  A)
   An atom of helium contains two electrons.   done clear
  B)
   An atom of helium has two protons and four neutrons in its nucleus. done clear
  C)
   The proton (atomic) number of helium is four. done clear
  D)
   Helium acts as a diatomic molecule. done clear
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• question_answer8)
  Which of the following ions has the same number of electrons as a krypton atom with atomic number\[36\]?
  A)
   Chlorine                        done clear
  B)
   Sodium done clear
  C)
   Rubidium            done clear
  D)
          Xenon done clear
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• question_answer9)
  In elements \[_{15}^{31}P\]and\[_{16}^{32}S\], which of the following are the same?
  A)
   Number of nucleons       done clear
  B)
   Number of electrons done clear
  C)
   Number of neutrons          done clear
  D)
   Number of protons done clear
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• question_answer10)
  What is valency?
  A)
   The combining capacity of an element   done clear
  B)
   The atomicity of an element done clear
  C)
   The oxidation number of an element done clear
  D)
   All of the above done clear
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• question_answer11)
  An element \[X\] forms a un-positive ion with the electronic structure\[2,\,\,8,\,\,8\]. What is the atomic number of\[X\]?
  A)
  \[16\]                 done clear
  B)
         \[17\] done clear
  C)
  \[18\]                 done clear
  D)
         \[19\]   done clear
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• question_answer12)
  The letters \[X,\,\,Y\] and \[Z\] represent different atoms. \[_{19}^{40}X\,\,\,\,\,_{19}^{39}Y\,\,\,\,\,\,\,_{20}^{40}Z\] What can be deduced from the proton numbers and nucleon numbers of\[X,\,\,Y\] and\[Z\]?
  A)
   \[X\] and \[Y\] are the same elements.   done clear
  B)
   \[X\] and \[Z\] are the same elements. done clear
  C)
   \[X\] has more protons than \[Y\]. done clear
  D)
   \[Z\] has more neutrons than\[Y\]. done clear
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• question_answer13)
  What is the maximum number of electrons that can be accommodated in the 4th energy level?
  A)
  \[32\]                   done clear
  B)
         \[18\] done clear
  C)
  \[2\]                  done clear
  D)
         \[8\] done clear
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• question_answer14)
  A neutral atom of an element has a nucleus with a nuclear charge \[13\] times and mass \[27\] times as that of hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?
  A)
   \[27:13\]                       done clear
  B)
   \[10:13\]   done clear
  C)
   \[20:24\]           done clear
  D)
          \[10:14\] done clear
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• question_answer15)
  What does Bohr's atomic theory explain?
  A)
   About quantum numbers done clear
  B)
   About the shape of sub-levels done clear
  C)
   About nucleus done clear
  D)
   About stationary states   done clear
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• question_answer16)
  Which of the following observations of \[\alpha -\]ray scattering experiment led to the discovery of a small positively charged nucleus in the centre?
  A)
   Most of the \[\alpha -\]particles passed straight. done clear
  B)
   Most of the \[\alpha -\]particles rebounded after hitting the atoms. done clear
  C)
   Only a few \[\alpha -\]particles deflected away from their path.   done clear
  D)
   Most of the \[\alpha -\]particles rebounded. done clear
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• question_answer17)
  Which of the following electronic configurations is incorrect7
  A)
  \[Be(4)=2,\,\,2\]             done clear
  B)
  \[O(8)=2,\,\,6\] done clear
  C)
  \[S(16)=2,\,\,6,\,\,8\]   done clear
  D)
         \[P(15)=2,\,\,8,\,\,5\] done clear
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• question_answer18)
  An atom has mass number 23 and atomic number\[11\]. How many protons, electrons and neutrons are present in the atom?
  A)
  \[11,\,\,12,\,\,13\]            done clear
  B)
         \[11,\,\,11,\,\,12\]   done clear
  C)
  \[11,\,\,11,\,\,13\]            done clear
  D)
         \[11,\,\,14,\,\,15\] done clear
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• question_answer19)
  Which of the following electronic configurations represents a noble gas?
  A)
  \[2,\,\,8,\,\,2\]                 done clear
  B)
  \[2,\,\,8,\,\,6\] done clear
  C)
  \[2,\,\,8\]                          done clear
  D)
         \[2,\,\,8,\,\,8,\,\,2\] done clear
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• question_answer20)
  An element has atomic number \[17\] and mass number\[37\]. There are \[17\] electrons outside the nucleus. Find the number of neutrons in it.
  A)
  \[20\]                               done clear
  B)
  \[21\] done clear
  C)
  \[17\]                 done clear
  D)
         \[37\] done clear
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• question_answer21)
  What does the mass number of an atom represent?
  A)
   Only the number of protons done clear
  B)
   The number of protons and neutrons   done clear
  C)
   The number of protons and electrons done clear
  D)
   Only the number of neutrons done clear
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• question_answer22)
  The atom of an element has \[10\] electrons, \[10\] protons and \[12\] neutrons. Find the mass number of the element.
  A)
  \[10\]                             done clear
  B)
  \[12\] done clear
  C)
  \[22\]                   done clear
  D)
         \[32\] done clear
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• question_answer23)
  \[_{17}^{35}Cl\]and \[_{17}^{37}Cl\] are examples of\['X'\]. What is\['X'\]?
  A)
   Isobars             done clear
  B)
          Isotopes   done clear
  C)
   Isotones            done clear
  D)
          Isomers done clear
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• question_answer24)
  Which of the following statements is false?
  A)
   Neutron has the highest mass among the fundamental particles. done clear
  B)
   The mass of an electron is negligible. done clear
  C)
   The value of e/m is the highest for a proton.   done clear
  D)
   Charge of a neutron is zero. done clear
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• question_answer25)
  Which of the following is true about the \[e/m\] value of positive particles?
  A)
   It is constant. done clear
  B)
   It depends on the gas taken in the discharge tube.   done clear
  C)
   It depends on the nature of cathode and anode taken. done clear
  D)
   It depends on the fluorescent material coated on the screen. done clear
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• question_answer26)
  Element \['X'\] contains \[9\] protons, \[10\] electrons and \[11\] neutrons. What is\['X'\]?
  A)
   A neutral atom done clear
  B)
          An isotope done clear
  C)
   A cation           done clear
  D)
          An anion   done clear
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• question_answer27)
  Which of the following are present in an atom with atomic number \[82\] and mass number\[208\]?
  A)
   \[82\] protons and \[82\] electrons done clear
  B)
   \[82\]protons and \[126\] neutrons done clear
  C)
   \[82\]protons, \[82\] electrons and \[126\] neutrons   done clear
  D)
   \[82\]neutrons, \[126\] protons and \[126\] electrons done clear
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• question_answer28)
  Which of the following ions is the smallest in size?
  A)
  \[M{{g}^{2+}}\]            done clear
  B)
         \[N{{a}^{+}}\] done clear
  C)
  \[{{O}^{2-}}\]             done clear
  D)
         \[{{F}^{-}}\] done clear
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• question_answer29)
  Which of the following gas when taken in the discharge tube produces maximum specific charge of positive rays?
  A)
   Oxygen            done clear
  B)
          Nitrogen done clear
  C)
   Helium             done clear
  D)
          Hydrogen   done clear
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• question_answer30)
  In an element, the number of protons, electrons and neutrons are \[1,\,\,0,\,\,1\] respectively. Identify the element.
  A)
  \[{{D}^{+}}\]                           done clear
  B)
  \[{{H}^{+}}\] done clear
  C)
  \[He\]                            done clear
  D)
  \[L{{i}^{+}}\] done clear
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• question_answer31)
  What is the maximum number of electrons in the main shell of an atom?
  A)
  \[{{n}^{2}}\]               done clear
  B)
         \[2{{n}^{2}}\]   done clear
  C)
  \[2n\]                 done clear
  D)
         \[4n+1\] done clear
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• question_answer32)
  How many protons, neutrons and electrons are contained in one atom of\[_{19}^{39}K\]?
  A)
   \[19\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons   done clear
  B)
   \[19\] protons \[+\,\,20\] neutrons \[+\,\,20\] electrons done clear
  C)
   \[20\] protons \[+\,\,19\] neutrons \[+\,\,20\] electrons done clear
  D)
   \[20\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons done clear
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• question_answer33)
  What do oxygen atom and oxide ion have in common?
  A)
   Same size done clear
  B)
   Same number of electrons done clear
  C)
   Same electronic configuration done clear
  D)
   Same number of protons   done clear
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• question_answer34)
  Identify the number of electrons present in the outermost shell of atoms of each of the following elements.
  A)
   (i) - 2, (ii) - 3, (iii) ? 4 done clear
  B)
   (i) - 1, (ii) - 4, (iii) ? 6 done clear
  C)
   (i) - 2, (ii) - 2, (iii) ? 6   done clear
  D)
   (i) - 3, (ii) - 4, (iii) ? 5 done clear
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• question_answer35)
  The atomic numbers of three elements \[P,\,\,Q\] and \[R\] are \[5,\,\,9\] and \[13\] respectively. Which two elements show similar chemical properties?
  A)
   \[P\]and\[Q\]                             done clear
  B)
   \[P\] and \[R\]   done clear
  C)
   \[Q\]and\[R\]                 done clear
  D)
          \[P,\,\,Q\]and\[R\] done clear
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• question_answer36)
  Identify the element having two electrons in the K shell of its atom.
  A)
   Hydrogen                      done clear
  B)
   \[H{{e}^{+}}\] done clear
  C)
   Helium               done clear
  D)
          Deuterium done clear
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• question_answer37)
  The total number of electrons in a nitrogen atom and a chlorine atom are \[7\] and \[17\] respectively. Find the number of valence electrons in them.
  A)
  \[3,\,\,1\]                        done clear
  B)
         \[5,\,\,8\] done clear
  C)
  \[4,\,\,1\]                        done clear
  D)
         \[5,\,\,7\]   done clear
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• question_answer38)
  An element has an atomic number 20. How many electrons will be present in \[K,\,\,L,\,\,M\] and \[N\] shells of its atom?
  A)
  \[2,\,\,8,\,\,6,\,\,4\]          done clear
  B)
         \[2,\,\,8,\,\,7,\,\,3\] done clear
  C)
  \[3,\,\,7,\,\,7,\,\,3\]          done clear
  D)
         \[2,\,\,8,\,\,8,\,\,2\]   done clear
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• question_answer39)
  An atom and its ion differ in the number of
  A)
   electrons             done clear
  B)
          protons done clear
  C)
   neutrons           done clear
  D)
          nucleons done clear
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• question_answer40)
  What is the ratio of the neutrons present in carbon and silicon atoms with respect to their atomic masses? (Atomic mass of carbon and silicon are \[12\] and \[28\] respectively)
  A)
  \[3:7\]                  done clear
  B)
         \[7:3\] done clear
  C)
  \[3:4\]                            done clear
  D)
  \[6:28\] done clear
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• question_answer41)
  According to JJ. Thomson's atomic model, where are the negative charges of an atom embedded in?
  A)
   A lump of positive charge   done clear
  B)
   A lump of small atoms done clear
  C)
   A lump of neutrons done clear
  D)
   The nucleus done clear
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• question_answer42)
  Which of the following conclusions cannot be drawn on Rutherford's atomic model?
  A)
   The total mass of an atom is concentrated at the centre of the atom. done clear
  B)
   Nucleus is located inside the atom containing positively charged particles. done clear
  C)
   Most of the atom is empty in space. done clear
  D)
   Electrons revolve around the nucleus in stationary, circular orbits.   done clear
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• question_answer43)
  Which of the following is a pair of isobars?
  A)
  \[_{7}^{15}N,\,\,_{8}^{16}O\]            done clear
  B)
         \[_{6}^{13}C,\,\,_{7}^{14}N\] done clear
  C)
  \[_{6}^{13}C,\,\,_{7}^{13}N\]              done clear
  D)
         \[_{6}^{13}C,\,\,_{8}^{15}O\] done clear
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• question_answer44)
  An isotope of helium is represented by the symbol\[_{2}^{3}He\]. How many protons, neutrons and electrons are there in an atom of the isotope?
  A)

  Protons	Neutrons	Electrons
  1	2	1

  done clear
  B)

  Protons	Neutrons	Electrons
  1	3	2

  done clear
  C)

  Protons	Neutrons	Electrons
  2	1	2

    done clear
  D)

  Protons	Neutrons	Electrons
  2	3	2

  done clear
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• question_answer45)
  How are the two atoms\[_{92}^{235}P\] and\[_{92}^{238}P\]similar?
  A)
   Only (i) done clear
  B)
                      Only (i) and (ii) done clear
  C)
   Only (i) and (iii)   done clear
  D)
   (i), (ii) and (iii) done clear
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• question_answer46)
  Identify the least reactive element from the following.
  A)
  \[_{8}^{16}X\]             done clear
  B)
         \[_{10}^{20}X\]   done clear
  C)
  \[_{11}^{23}X\]                       done clear
  D)
         \[_{9}^{19}X\] done clear
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• question_answer47)
  What is the ratio of the number of neutrons present in potassium and magnesium atoms with mass numbers \[39\] and \[24\] respectively?
  A)
  \[19:12\]            done clear
  B)
         \[5:3\]   done clear
  C)
  \[5:6\]                done clear
  D)
         \[4:3\] done clear
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• question_answer48)
  A beam of alpha-particles is fired at a piece of gold foil as shown below. After striking the gold foil, in which direction do most of the alpha-particles travel?
  A)
  \[P\]                    done clear
  B)
         \[Q\] done clear
  C)
  \[R\]                  done clear
  D)
         \[S\] done clear
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• question_answer49)
  Which of the following statements about the isotopes of an element is NOT correct?
  A)
   Isotopes have the same proton number. done clear
  B)
   Isotopes have the same chemical properties. done clear
  C)
   Isotopes have the same nucleon number.   done clear
  D)
   Atoms of the isotopes of the element have the same number of electrons. done clear
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• question_answer50)
  An element \[X\] combines with oxygen to form compounds \[P\] and\[Q\]. If the ratio of the valency of element \[X\] in \[P\] to element \[X\] in \[Q\] is \[3:5\] respectively, what could be the probable compounds \[P\] and\[Q\]?
  A)

  P	Q
  \[CO\]	\[C{{O}_{2}}\]

  done clear
  B)

  P	Q
  \[{{N}_{2}}{{O}_{3}}\]	\[{{N}_{2}}{{O}_{5}}\]

    done clear
  C)

  P	Q
  \[{{H}_{2}}O\]	\[{{H}_{2}}{{O}_{2}}\]

  done clear
  D)

  P	Q
  \[C{{H}_{4}}\]	\[{{C}_{3}}{{H}_{8}}\]

  done clear
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