Question
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.