1.

Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are : (a) A, B, C (b) B,C,D (c) A, D, E (d) B, D, E

Answer»

Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are :

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



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