1.

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is : (a) A and B (b) B and D (c) A and C (d) D and E

Answer»

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is :

(a) A and B (b) B and D (c) A and C (d) D and E



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