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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