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Question

Number of valence electrons in $${Cl}^{-}$$ ion are:


A
16
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B
8
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C
17
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D
18
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Solution

The correct option is B $$8$$
The electronic configuration of chlorine is 2, 8, 7 (Atomic number-17).
$$Cl^-$$ is formed from adding one electron so the new electronic configuration is 2, 8, 8. So the valence electrons is 8.

Science
NCERT
Standard IX

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