Which of the following can have
no. of unpaired
maximum
electrons n
6 Fe
0
Fe (I)
010
① MI)
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ANSWER
Fe
2+
has the maximum number of unpaired d-electrons.
Zn(30)=[Ar]3d
10
,4s
2
Zn
2+
=[Ar]3d
10
: No unpaired electron
Fe(26)=[Ar]3d
6
,4s
2
Fe
2+
=[Ar]3d
6
: Four unpaired electrons.
Ni(28)=[Ar]3d
8
,4s
2
Ni
3+
=[Ar]3d
7
: Three unpaired electrons.
Cu(29)=[Ar]3d
10
,4s
1
Cu
+
=[Ar]3d
10
: No unpaired electrons.
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