1.

State the valencies of the following elements : magnesium and sodium.

Answer»

Magnesium : 

a) Atomic number of magnesium is 12. 

b) Distribution of electrons is 2, 8, 2. 

c) Hence the valency is 2. 

Sodium : 

a) Atomic number of sodium is 11. 

b) Distribution of electrons is 2, 8, 1. 

c) Hence the valency is 1.



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