Which among the following set of elements contain same number of valence electrons?

Options

A. `""_(11)^(23)X,""_(20)^(40)Y`
B. `""_(10)^(20)X,""_(19)^(39)Y`
C. `""_(11)^(23)X,""_(19)^(39)Y`
D. `""_(18)^(40)X,""_(26)^(40)Y`

Answer

C

Explanation

`""_(11)^(23)X,""_(19)^(39)Y` have one valence electron as they are sodium and potassium with electronic arrangements 2,8,1 and 2,8,8,1 respectively.