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 D2,3 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 3d−subshell 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.