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Q.

The number of electrons present in M-shell of chromium atom is

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a

2

b

13

c

24

d

81

answer is B.

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Detailed Solution

$E.C of c r - \frac{1 s^{2}}{K} \frac{2 s^{2} 2 p^{6}}{L} \frac{3 s^{2} 3 p^{6} 3 d^{5}}{M} \frac{4 s^{1}}{N}$
In m-shell, no of electrons = 2+6+5=13

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