Consider the ground state of Cr atom (Z =24). The numbers of electrons with the azimuthal quantum numbers, l= 1 and 2 are respectively

Options

A. 12 and 4
B. 12 and 5
C. 16 and 4
D. 16 and 5

Answer

B

Explanation

`._(24)Cr rarr 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`
We know for p, l = 1 and for d, l = 2.
For l = 1, total number of electrons `= 12[2p^(6) and 3p^(6)]`
For l = 2, total number of electrons `=5[3d^(5)]`