A) 13, 31
B) 11, 20
C) 12, 10
D) 21, 33
Correct Answer: A
Solution :
The elements\[_{13}Al\]and\[_{31}Ga\]belong to boron family. These have similar properties due to similar electronic configuration \[({{s}_{1}}{{p}_{1}})\] in their outermost shell.
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