0
question_answer1) Identify the following from their description. (a) These are the rays produced in the discharge tube. These rays deflect towards the +ve plate in an electric field, and contain the universal constituent of matter. (b) This is a subatomic particle present in all the atoms except Hydrogen. (c) These are rays used by James Chadwick and Rutherford for their important experiments to understand the structure of an atom.
question_answer2) Find the number of electrons whose mass is equal to the total mass of neutrons present in one calcium atom.
question_answer3) Why is Rutherford's atomic model called nuclear model. Solar model respectively?
question_answer4) What is the purpose of lead block and ZnS in Rutherford's gold foil experiment?
question_answer5) 'x' is the unit used to measure the atomic particles and 'y' is the S.I. unit of mass. Find y/x.
question_answer6) What is the amount of charge in coulomb's present on stable oxide ion?
question_answer7) 1 Coulomb = _____ electrons.
question_answer8) An atom has mass number A and atomic number Z: (a) How many protons are present in the nucleus? (b) How many electrons revolve around the nucleus? (c) How many neutrons are present in the nucleus?
question_answer9) The electronic configuration of a tripositively charged ion\[({{X}^{+3}})\]is 2, 8. Then (a) Identify the element and find the number of neutrons in it. (b) Write the formula of the compound that it forms with chlorine and oxygen respectively. (c) Name the element whose dinegatively charged ion is isoelectronic with\[{{X}^{+3}}\]. (d) What is the valency of 'X' ? Name the group in periodic table to which it belongs. (e) Find the number of 'M' electrons present in its neutral atom.
question_answer10) What is the formula of the compound formed by P and Q if the number of electrons present in their outermost shells (M-shell) is 3 and 7 respectively?
question_answer11) Why does atomic number not change during a chemical reaction?
question_answer12) The ratio of mass of one atom of nitrogen to its atomic weight is x. The ratio of mass of one atom of calcium to its atomic weight is y. Find x / y.
question_answer13) What is the charge present on an atom containing 8 protons, 10 neutrons and 10 electrons?
question_answer14) The atomic number of elements P, Q and R are 7, 11, 15 respectively. State with a reason which two elements are likely to have same chemical properties?
question_answer15) (a) The valence electrons in three elements R, A, J was found to be 1, 2, 3 respectively. Then, predict the nature of R, A, J. (b) The valence electrons in four elements A, R, T, I was found to be 4, 5, 6, 7 respectively. Then, predict the nature of A, R, T, I. (c) Identify an element which has one electron in K-shell but is a non-metal. (d) Identify an element that has two electrons in K-shell (other shells are empty, but is a noble gas.
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.