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  • 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

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

Answers (1)

Ans (c)
Sol
Electronic configuration of A (atomic number 9): 2,7
Electronic configuration of B (atomic number 11): 2,8,1
Electronic configuration of C (atomic number 17): 2,8,7
Electronic configuration of D (atomic number 12): 2,8,2
Electronic configuration of E (atomic number 13): 2,8,3
Elements having same number of electrons in the outer most shell belong to same group therefore A and C belong to same group

Hence option (c) is correct.

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infoexpert27

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