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Manipal Entrance Test 2016 Chemistry Paper
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© examsnet.com
Question : 8
Total: 50
The electronic configurations of chromium (at. no. 24 ) and copper (at. no. 29 ) are
[
Ar
]
4
s
1
3
d
5
and
[
Ar
]
4
s
1
3
d
10
[
Ar
]
4
s
2
3
d
4
and
[
Ar
]
4
s
1
3
d
10
[
Ar
]
4
s
1
3
d
5
and
[
Ar
]
4
s
2
3
d
9
[
Ar
]
4
s
2
3
d
4
and
[
Ar
]
4
s
2
3
d
9
Validate
Solution:
Chromium and copper have five and ten electrons in
3
d
-orbitals rather than four and nine because fully-filled and half-filled orbitals have lower energy and thus have extra stability. Therefore, chromium and copper have
d
5
and
d
10
-configurations.
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