NEET Physics Nuclei Questions Solved


 If the mass number of an atom is A = 40 and its electron configuration is 1s22s22p63s23p6, the number of neutrons and protons in its nucleus will be 
(a) 22, 18            (b) 18, 22
(c) 20, 20            (d) 18, 18

(a) Number of protons = 2 + 2 + 6 + 2 + 6 = 18
Number of neutrons = 40 – 18 = 22.

Difficulty Level:

  • 74%
  • 6%
  • 11%
  • 11%