Write completely the electronic configurations of K and Rb.

Explanation

The electronic configuration of K is `1s^2 2s^2 2p^6 3s^2 3p^6 4s^1`
The electronic configuration of Rb is `1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1`