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Atoms

How many elec...

Question

How many electrons are present in the M shell of the atom of an element with atomic number 24?

A

5

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B

6

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C

12

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D

13

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Solution

The correct option is D 13
Electronic configuration of $C r$ (atomic number 24) $= [N e] 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}$
Therefore number of electrons in M shell (third shell) $= 2 + 6 + 5 = 13.$

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