What are the Magic Numbers for Atoms?

Question

 Which one can be the possible Answer?

A. No. Of e that confer Atomic Stability.

B. n/p ratio that confer Nuclear stability.

C. Atomic No. Confer Nuclear stability.

D. Atomic mass indicates fissile isotope.

E. No. Of p or n confer nuclear stability.

Answer 1

So what is a “magic number” in nuclear chemistry?  Basically it is a number of nucleons, which can be either protons or neutrons, separately, arranged into complete shells within the atomic nucleus. The most widely recognized magic numbers are 2, 8, 20, 28, 50, 82, and 126. Thus I would say that of the options offered, the best answer would be ...

 

E. No. of p or n confer nuclear stability.  Assuming p and n refer to protons and neutrons respectively. 

Answer 2

full outer shell numbers...