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Question

The number of occupied sub-shells in Cr3+ ion is:

A
3
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B
4
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C
5
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D
6
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Solution

The correct option is D 6
The sub-shell electronic configuration of
Cr 1s2, 2s2, 2p6, 3s2, 3p6, 3d54s1
Cr3+ 1s2, 2s2, 2p6, 3s2, 3p6, 3d3

Therefore the number of sub-shells is 6( 1s,2s.2p,3s,3p,3d).

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