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Question: (1), (2) and (3) are elements in the third short period. Oxide of (1) is ionic , that of (2) is amph...

(1), (2) and (3) are elements in the third short period. Oxide of (1) is ionic , that of (2) is amphoteric and of (3) a giant molecule. (1), (2) and (3) have atomic numbers in the order of-

A

(1) < (2) < (3)

B

(3) < (2) < (1)

C

(1) < (3) < (2)

D

(2) < (1) < (3)

Answer

(1) < (2) < (3)

Explanation

Solution

A, B and C are magnesium ,aluminium and silicon. Magnesium form ionic oxide, MgO ; Aluminium forms amphoteric oxide ,Al2O3 and silicon forms a giant molecule SiO2.