A) 12 or 13
B) 13 or 14
C) 10 or 11
D) 11 or 12
Correct Answer: D
Solution :
Key Idea: The values of quantum number will give idea about the last subshell of element. From that value we can find the atomic number of element \[n=3\] means 3rd shell \[\left. \begin{align} & l=0 \\ & m=0 \\ \end{align} \right\}means\text{ }sub\text{ }shell\] It means it is 3s subshell which can have 1 or 2 electrons. \[\therefore \] Configuration of element is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{1-2}}\] \[\therefore \] Atomic no. is 11 or 12
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