Question

Which of the following does not have valence 2

a)Mg
b)Ca
c)Na ​

Answer 1

Answer:

Correct option is

A

Zn, Mg

B

Cl, I

D

C, Ge

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.

Answer 2

Answer:

Option C, Na does not have valence 2. It lies in group 1 whereas Ca and Mg lie in group 2 of the periodic table.