Indicate the number of unpaired electrons in:
a. `P, b. Si, c. Cr`,
d. `Fe, e. Kr`

Explanation

(a)P(Z=15) :`[Ne]^(10)3s^(2)3p^(3)` , No. of unpaired electrons = 3
(b) Si (Z=14) : `[Ne]^(10)3s^(2)3p^(2) ` , No. of unpaired electrons = 2
(c) Cr (Z=24) : `[Ar]^(18)4s^(1)3d^(5) ` , No. of unpaired electrons = 6
(d) Fe (Z=26) : `[Ar]^(18) 4s^(2)3d^(6)` , No. of unpaired electrons =4
(e) Kr (Z=36) : `[Ar]^(18)4s^(2)3d^(10)4p^(6)` , No. of unpaired electrons = Nil.