electric configuration of cr
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Since the last electron enters the 3d-subshell, the expected electronic configuration of Chromium (Cr)(Z=24) is
12222632364234
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
2
3
d
4
But the observed electronic configuration is
12222632364135
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
1
3
d
5
The reason for this:-
We know that half filled & fully filled orbitals are stable. We also know that d-orbital can have maximum of 10 electrons. In Chromium, it is only one electron less than achieving the stable half filled electronic configuration & it also has somewhat similar energy as 4s orbital. So, it borrows ine electron from 4s-orbital & becomes half filled & stable.
12222632364234
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
2
3
d
4
But the observed electronic configuration is
12222632364135
1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
1
3
d
5
The reason for this:-
We know that half filled & fully filled orbitals are stable. We also know that d-orbital can have maximum of 10 electrons. In Chromium, it is only one electron less than achieving the stable half filled electronic configuration & it also has somewhat similar energy as 4s orbital. So, it borrows ine electron from 4s-orbital & becomes half filled & stable.
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