Question

Which pair of atomic numbers represents elements in the same group ?
A. 12, 20
B. 6, 13
C. 8, 17
D. 3, 15
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Answer 1

Answer:

option A is correct . same valence electrons represent same group

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Answer 2

The answer is A, because elements of same grp have same no. of valence electrons, and in the case A -

12 - 2,8,2

20 - 2,8,8,2

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