arrange the following electrons in order of increasing number of unpaired electrons iron magnesium zinc nickel copper
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The compound which has the maximum number of unpaired electrons will have higher magnetic moment.
The complexes and the number of unpaired electrons present in them are given below:
VCl
3
; V
3+
;[Ar]
18
3d
2
=2 unpaired electrons
VO
2+
; V
4+
;[Ar]
18
3d
1
=1 unpaired electron
[VO
4
]
3−
; V
5+
;[Ar]
18
3d
0
= no unpaired electron
[V(H
2
O)
6
]
2+
; V
2+
;[Ar]
18
3d
3
=3 unpaired electrons
Hence, the correct order is III<II<I<IV.
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