Question

Which pair of atomic numbers represents elements in the same group ?

a) 11,19 b) 6,12 c) 4,16 d) 8,17​

Answer 1

Answer:

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Correct option is

C

13, 31

Option A :

At. No. EC

11 2, 8, 1

20 48, 8, 2

Option B :

At. No. EC

12 2, 8, 3

30 2, 8, 18, 2

(but this belong to transition elements)

Option C :

At. No. EC

13 2, 8, 3

31 2, 8, 18, 3

[They belong to same group III A]

Option D :

At. No. EC

14 2, 8, 4

33 2, 8, 18, 5

Hence, the correct option is C

Answer 2

║Answer is c  4,16║

hope it is helpful