Give the atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference in the number of total p- and s- electrons.

Answer

36

Explanation

First gas which contains d-electrons is Kr.
`1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6`
Total number of d-electrons = 10
Total number of p-electrons =6+6+6=18
Total number of s-electrons =2+2+2+2=8
Difference in total number of p- and s- electrons =18-8 =10
So inert gas is `._36Kr`