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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