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Question

How many orbitals in this subshell have an unpaired electron, if an atom has eight electrons in a 3d subshell?

A
1
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B
2
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C
3
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D
4
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E
5
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Solution

The correct option is B 2
The 3d-subshell will contain a total of five 3d-orbitals. When assigning electrons in orbitals, each electron will first fill all the orbitals with similar energy (also referred to as degenerate) before pairing with another electron in a half-filled orbital. The atom having eight electrons should have two 3d orbitals with an unpaired electron.

Hence, the correct option is B

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