Question

The pair of elements having same number of valence electron :

• A. Zn, Mg
• B. Cl, I
• C. Na, Ca
• D. C, Ge

Answer 1

Answer: (A), (B), (D)

Cl, I
C, Ge
Zn, Mg

Atoms which are present in the same group of the periodic table will have same number of valence electrons. Hence $Cl,I$ of group $17$, $Na,Ca$ group $1$ and $C,Ge$ group $14$ have same valence electrons.