Question

Among the following pairs of atomic numbers, the element belonging to the same group are
a) 11, 20
b) 12, 30
c) 13, 31
d) 14, 33​

Answer 1

Answer:

13 ,31

Explanation:

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Answer 2

Answer:

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