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Question

Electronic configuration of element T is 2, 8, 7.

What is the group number of T ?

A

15

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B

16

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C

17

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D

18

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Solution

The correct option is C 17
It has 7 electrons in its valence shell. As after 4 valence electrons we should add +10 for the valence electrons even here we get $10 + 7 = 17$ .
Hence group number is 17.

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