A) 1
B) 2
C) 3
D) 4
Correct Answer: D
Solution :
The electronic configuration of Ca (at. no. 20) is Ca(20) :\[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}}\] Period number = 4
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