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Question 1

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

Answer

Valency of a particle is the quantity of electrons acquired, lost or shared to finish the octet of electrons in the valence shell.
Valency of chloride: It has electronic design = 2, 8, 7
In this manner, one electron is acquired to finish its octet thus its valency is 1.
Valency of sulfur: Its has electronic design = 2, 8, 6
In this manner, 2 electrons are acquired to finish its octet and henceforth its valency = 2
Valency of magnesium : It has electronic design = 2, 8, 2
Accordingly, it can lose two electrons to achieve octet and thus its valency = 2

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