Question

16
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair
of elements belongs to the same group?
(1 Point)
Ta A and B
(b) B and D
(C) A and C
(d) D and E​

Answer 1

Answer:

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group ? Elements which differ in atomic numer by 8 i.e., 9 (A fluorine) and 17 (Cl, chlorine) lie in the same group i.e., group 17 (halogens).

Answer 2

Explanation:

♤ Elements which differ in atomic numer by 8 i.e., 9 (A fluorine) and 17 (Cl, chlorine) lie in the same group i.e., group 17 (halogens).

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