Question

The electronic configuration of four elements are given below.

Which elements does not belong to same family as others?

• A. $\left[xe\right]4f^{14}5d^{10}6s^2$
• B. $\left[kr\right]4d^{10}5s^2$
• C. $\left[Ne\right]3s^{2}3p^5$
• D. $\left[Ar\right]3d^{10}4s^2$

Answer 1

The correct option is C $\left[Ne\right]3s^{2}3p^5$

Options b and d belong to same group since each one of them have two 2 electrons in the outermost shell, in contrast element (c) has 7 electrons in the valence shell