The total number of electrons in the ground state of Chromium with magnetic quantum number, m=0 is

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Solution

The correct option is B 12
Cr has $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}$ configuration in the ground state
Total electrons with m=0 are 2+2+2+2+2+1+1=12

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