Question

an atom of element x has three orbits around its nucleus.what is it maxximun electron holding capacity

Answer 1

the maximum holding capacity of the atom is :
K shell               L shell                M shell
  2                          8                         8
therefore the answer is 18 electrons . 
         i hope it helps..................

Answer 2

the maximum holding capacity of the atom is :
K shell                 L shell                M shell
    2                             8                         8
So the maximum electron holding capicity will be :- 2+8+8= 16