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Question
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is :
(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 numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is :
(a) A and B (b) B and D (c) A and C (d) D and E
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Solution
(c) A and C
Electronic configuration of A (9): K = 2 L = 7
Electronic configuration of C (17): K = 2 L = 8 M = 7
Group number of A and B = valence electron + 10
= 7+10 = 17.
(c) A and C
Electronic configuration of A (9): K = 2 L = 7
Electronic configuration of C (17): K = 2 L = 8 M = 7
Group number of A and B = valence electron + 10
= 7+10 = 17.
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