Question

Write the electronic configuration of (i) `Mn^(4+) (ii) Fe^(3+) (iii) Cr^(2+) ` and `Zn^(2+)`. Report the number of upaired electrons in each case.

Answer 1

(a) `Mn^(4+)(Z=25) , 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(3) " " ` (3 unpaired electrons)
(b) `Fe^(3+) (Z=26) , 1s^(2) 2s^(2)2p^(6)3s^(2)3p^(6)3d^(5) " "`(5 unpaired electrons)
(c) `Cr^(2+) (Z=24) , 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(4) " " `(4 unpaired electrons)
(d)`Zn^(2+) (Z=30) , 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) " " `(0 unpaired electrons)