Indicate the total number of: (a) p electrons in N (Z = 7) (b) s electrons in Si (Z = 14) (c) 3d electrons in S (Z = 16)?

(a)
The electronic configuration of N : 1s² 2s² 2p³
There are 3 electrons in 2p orbitals.
Total number of p electrons in N = 3

(b)
The electronic configuration of Si : 1s² 2s² 2p⁶ 3s² 3p²
There are two 1s electrons, two 2s electrons, and two 3s electrons.
Total number of s electrons in Si = 2 + 2 + 2 = 6

(c)
The electronic configuration of S : 1s² 2s² 2p⁶ 3s² 3p⁴
The 3d orbitals are empty.
Total number of 3d electrons in S = 0