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Question
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?
Options
A and B
B and D
A and C
D and E
Solution
A and C
Explanation -
Electronic configuration of A = 2,7
Electronic configuration of B = 2,8,1
Electronic configuration of C = 2,8,7
Electronic configuration of D = 2,8,2
Electronic configuration of E = 2,8,3
According to the electronic configuration of the given elements, only elements A and C have 7 valance electrons. So, A and C belong to the same group in the modern periodic table.
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