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Question

Calculate the minimum and the maximum number of electrons which may have magnetic quantum number, m=+1 and spin quantum number, s=−12 in chromium (Cr).

A
0,1
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B
1,2
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C
4,6
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D
2,3
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Solution

The correct option is D 2,3
Both 2p and 3p subshells are completely filled.
Hence, out of 6 electrons in the 2p subshell one electron must have m=+1 and s=12.
Similarly, out of 6 electrons in the 3p subshell one electron must have m=+1 and s=12.

But in 3dsubshell an electron having m=+1 may have spin quantum number 12 or +12.
Therefore, the minimum and the maximum number of electrons with configuration m=+1 and s=12 are 2 and 3 respectively.

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