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Question 7
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. 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


Solution

Option (c) is correct.
Elements A and C have electrons in their valence shell. All the elements which belong to the same group should have the same number of valence electrons.

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