Name the noble gas and give its atomic number if the number of d-electrons present in this atom is equal to the difference in the no. of electrons present in the p and s-subshells.

Explanation

The noble gas is krypton `(Kr)`. Its atomic number=36
electronic configuration: `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)`
Number of s-electrons=2+2+2+2=8
Number of p-electron=6+6+6=18
Number of d-electrons=10
`therefore`Number of p-electron-number of s-electrons=18-8=10=number of d-electrons.