A) 33
B) 34
C) 31
D) 49
Correct Answer: A
Solution :
The element with the electronic configuration\[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{3}}\] is phosphorus (at. no =15), the element below it in the Periodic Table will have atomic number = (15 + 18) = 33 (Arsenic) Or the element below it has outer configuration\[4{{s}^{2}},4{{p}^{3}}.\] Its complete configuration is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},\]\[4{{s}^{2}},3{{d}^{10}},4{{p}^{3}}.\]Thus, the atomic no is 33.You need to login to perform this action.
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