Question

How will you find the valency of chlorine, sulphur and
magnesium?
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Answer 1

Answer:

with the help of atomic number

Answer 2

Answer:

Atomic number of chlorine is 17

By electronic configuration we get

K L M

2 8 7

so to complete it's octet chlorine needs 1 more electron

so the valency of chlorine is 1.

similarly valency of sulphur will be 2

and valency of magnesium will be 2

Hope it helps... thank u