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Question

An atom of an element has 4th shell as the valence shell with an electron pair in it. The number of electrons in 3rd shell is 2 times more than the number of electrons in 2nd shell. Identify atomic number.

A
24
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B
25
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C
27
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D
28
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Solution

The correct option is D 28
No. of electrons in 1st shell = 2
No. of electrons in 2nd shell = 8
No. of electrons in 3rd shell = 2×8 = 16
No. of electrons in 4th shell = 2
Therefore, total no. of electrons (atomic no.) = 28

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