The number of electrons present in M-shell of an element with atomic number 24 is

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answer is B.

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Detailed Solution

Electronic configuration of Atomic number 24: 1s² 2s²2p⁶3s² 3p⁶ 3d⁵ 4s¹
M-shell is third shell, i.e. n = 3
Number of electrons in third shell are 2+6+5 = 13

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