Science, asked by tanishamahekrahman, 7 months ago

xix) The element A,B,C,D and E have atomic
number 9, 11, 17, 12 and 13 respec-
tively. Which pair of elements belong to
the same group?
(a) A and B (b) B and D
(C) A and C (d) D and E​

Answers

Answered by khushiraj29
0

Answer:

(C) A and C is the correct answer.

Explanation:

We'll write the electronic configurations of the elements.

A (atomic no-9) = 2,7

B (atomic no-11) = 2,8,1

C (atomic no-17) = 2,8,7

D (atomic no-12) = 2,8,2

E (atomic no-13) = 2,8,3

We know that in a group, elements have same valence electrons.

Since, A and C have same valence electron i.e 7

Therefore, A and C belongs to same group.

Hope it helps :)

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