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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 (group

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(a) Silicon Reason: Tetrahedral structure

OR Tetravalency or Four valency 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