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Q.

What is the valency of chlorine?

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a

2

b

1

c

3

d

4

answer is D.

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Detailed Solution

 1

Chlorine's atomic number is 17, and its electronic configuration is 2, 8, 7.

The outermost shell has 7 electrons, meaning it needs 1 more electron to complete its octet (8 electrons for stability).

Valency is determined by the number of electrons an atom needs to gain, lose, or share to achieve a stable configuration.

Since chlorine needs 1 electron, its valency is 1.

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