A) lanthanides
B) actinides
C) alkaline earth metals
D) none of the above
Correct Answer: C
Solution :
Electronic configuration (atomic number 56) \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{6}}4{{d}^{10}}\]\[5{{s}^{2}}5{{p}^{6}},6{{s}^{2}}\] The last 2 electrons are filled in s orbital so the element belong to II group (alkaline earth). As the element contain six shells hence, it belong to sixth period.
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