The group in the modern periode table, in which all the elements do not have same number of electrons in their valence shell is :

Options

A. `13^(th)`
B. `11^(th)`
C. `9^(th)`
D. `18^(th)`

Answer

C, D

Explanation

`{:("Group no".,,e^(-)"is outermost shell"),(13^(th),,3),(11^(th),,1),(9^(th),,2 or 1),(18^(th),,2 or 8):}`