Q. The sodium nucleus $\ _{11}^{23}Na$ contains
A) 11 electrons
B) 12 protons
C) 23 protons
D) 12 neutrons
Explanation
(d) Number of neutrons $= A - Z = 23 - 11 = 12$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.