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Atomic Number and Mass Number

An atom of an...

Question

An atom of an element has two electrons in the M shell. Identify its atomic number.

A

10

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B

12

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C

14

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D

15

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Solution

The correct option is B 12
For M shell value of $n = 3$ . Thus the electronic configuration is : 2, 8, 2 and atomic number is 12.

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