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

Valency is the combining capacity of an atom of an element:

Chlorine,             

Atomic number = 17

Therefore, Protons = 17 , Electrons = 17

Therefore, Distribution of electron = K L M 

                                                                 = 2 8 7

Chlorine needs 1 electron to complete its outermost orbit/shell

Therefore, its valency is -1(gain 1 electron)

Sulphur ,

Atomic number = 16

Therefore, Protons = 16 ,  Electrons = 16

Therefore, Distribution of electron = K L M 

                                                                 = 2 8 6

Sulphur needs 2 electrons to complete its outermost shell

Therefore, its valency is -2(gain 2 electrons)

Magnesium,

Atomic number = 12

Therefore, Protons = 12 ,  Electrons = 12

Therefore, Distribution of electron = K L M 

                                                                 = 2 8  2

Magnesium needs to donate 2 electrons from its outermost shell to become stable

Therefore, its valency is +2 (donates 2 electrons).

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Updated on: 14-Mar-2023

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