A) II A group and 5th period
B) II A group and 2nd period
C) V A group and 2nd period
D) III A group and 5th period
Correct Answer: A
Solution :
The electronic configuration of atomic number 38 is \[X(38):1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}3{{d}^{10}}4{{p}^{6}},5{{s}^{2}}\]or \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},3{{d}^{10}},4{{s}^{2}}4{{p}^{6}},5{{s}^{2}}\] Hence, it is belongs to II A group and 5th period. It is strontium \[(Sr)\].
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