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

16

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8

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17

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18

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Solution

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

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Put tick () against correct choice and cross () against wrong choice in the following question:

Number of valence electrons in Cl⁻ ion are:

(a) 16

(b) 8

(d) 18

(a) 16

(b) 10

(d) 8

Write electronic configuration for the following elements.

$_{8}^{16} O$ , $_{14}^{28} S i$ , $_{17}^{35.5} C l$ , $_{18}^{40} A r$

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