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Question
Chemistry
The third ionization enthalpy is minimum for :
Q. The third ionization enthalpy is minimum for :
3242
232
JEE Main
JEE Main 2020
The d-and f-Block Elements
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A
Mn
23%
B
Co
6%
C
Ni
19%
D
Fe
52%
Solution:
Electronic configuration of
25
M
n
M
=
[
A
r
]
3
d
5
4
s
2
M
2
+
=
[
A
r
]
3
d
5
4
s
0
26
F
e
[
A
r
]
3
d
6
4
s
2
[
A
r
]
3
d
6
4
s
0
27
CO
[
A
r
]
3
d
7
4
s
2
[
A
r
]
3
d
7
4
s
0
28
N
i
[
A
r
]
3
d
8
4
s
2
[
A
r
]
3
d
8
4
s
0
So third ionisation energy is minimum for Fe.