1.

Choose an element from period 3 of modern periodic table that matches the description given below in each instance. Give reason for your choice. a. It has a similar structure to diamond. b. It has same valency as Lithium. c. It has variable valency and is a member of the Oxygen family

Answer»

a. Silicon

Reason: 

Tetrahedral structure 

OR 

Tetravalency or Four valeny and catenation 

OR 

Covalent bonding like carbon

b. Sodium

Reason: 

It has 1 valence electron like Lithium

c. Sulphur Reason: it forms oxides SO₂ and SO₃



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