Question

How many electrons in chromium have n+l value equal to 3?

Answer 1

Chromium has 10 subshells viz - 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f.

Number of electrons in subshell having l=0.

Ans: There are 4 subshells and the first three sub shells (n=1, n=2 and n=3) has 2 electrons each and (n=4) has 1 electron. Number of electrons having n + ℓ value=3.