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Quantum numbers, orbitals, nodes, electronic configuration
NEET level
Single correct option
Difficulty 1 of 3
as195
The number of unpaired electrons in the
Fe
X
3
+
ion (
Z
=
26
) in its ground state is
A
4
B
5
C
3
D
6
Answer: B
Fe is
[
Ar
]
3
d
6
4
s
2
.
Fe
X
3
+
loses the two
4
s
electrons and one
3
d
electron, giving
3
d
5
, with one electron in each of five
d
orbitals: 5 unpaired.
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