A) \[\text{Cl,}\,\text{Br}\]
B) \[Ca,Cl\]
C) \[Na,\text{ }Ca\]
D) \[Na,\text{ }Cl\]
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.You need to login to perform this action.
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