A) \[10,12\]
B) \[11,20\]
C) \[21,33\]
D) \[13,31\]
Correct Answer: D
Solution :
The elements 13 (Aluminium) and 31 (Galium) both belong to same group i.e., Ill A. Therefore, both elements have similar electronic configuration of the outermost shell and hence have similar properties. \[Al(1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\,3{{s}^{2}}\,3{{p}^{1}})\] \[Ga(1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\,3{{s}^{2}}\,3{{p}^{6}}\,3{{d}^{10}}\,4{{s}^{2}}\,4{{p}^{1}})\]
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