Practice Chemistry Questions on Atoms

Practice Chemistry Questions on Atoms
Chemistry Quiz - Questions & Answers on Atoms
1. The fundamental particles not present in the nucleus of hydrogen atom is
(a) electron
(b) Proton
(c) Neutron
(d) None of these
Ans. (c)


2. The maximum number of electrons that can be accommodated in M Shell of an atom are
(a) 8
(b) 32
(c) 18
(d) 25
Ans. (c)


3. The oil drop experiment by R.A. Mullikan was performed to find
(a) Charge on the neutron
(b) Charge on the electron
(c) Charge on the Proton
(d) None of these
Ans. (b)


4. The experiment which led to the discovery of nucleus was performed by
(a) Goldstein
(b) J.J. Thomson
(c) Dalton
(d) Rutherford
Ans. (d)


5. The electronic configuration of the element with Atomic number 19 is
(a) 2, 8, 7
(b) 2, 9, 8
(c) 2, 8, 8, 1
(d) 2, 10, 7
Ans. (c)


6. An element has electronic configuration 2,8,4. It will be classified as
(a) Metal
(b) Non metal
(c) Metalloid
(d) None of these
Ans. (b)


7. Amongst element X (2, 8, 6) and Y (2, 8, 8) which is more reactive and why?
(a) X because it is a metal
(b) Y because it is non metal
(c) Because it has 6 valence electrons
(d) Y because it is gas
Ans. (c)

8. Which of these is a pairs of isobar?
(a) 6C12, 8O16
(b) 6C13, 6C14
(c) 20Ca40, 18Ar40
(d) None of these
Ans. (c)



9. The e/m value for cathode rays
(a) Varies with the nature of the gas
(b) Does not vary with the nature of gas
(c) Could not be determined by J.J. Thomson
(d) Both (b) and (c) are correct
Ans. (b)


10. Isotopes differ in
(a) no. of electrons
(b) no. of protons
(c) no. of neutrons
(d) Chemical reactivity
Ans. (c)