A) \[Cl,\,Br\]
B) \[Ca,\,Cl\]
C) \[Na,\,Ca\]
D) \[Na,\,Cl\]
Correct Answer: D
Solution :
Sodium and chlorine are in same period. \[_{11}Na=2,\,\,8,\,\,1\] \[_{17}Cl=2,\,\,8,\,\,7\] Both have 3-shells, hence, they both are [placed in 3rd period of periodic table.
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