Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements. C :
H:
N:

O:
P:
CI:

Look at the screenshot below.

Those are your answers!

Good Luck.

Explanation:

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.