Question

Which two elements have the same number of valence electrons?

Answer 1

Answer: Silicon and Carbon have the same number of valence electron.

Explanation:

According to the electronic configuration,

Barium= 56 = 2,8,18,18,8,2

The electronic configuration of Barium

$Ba = 1s^2,2s^2 2p^6,3s^2 3p^6 3d^{10},4s^2 4p^6 4d^{10},5s^25p^6,6s^2$

Neon = 10 = 2,8

The electronic configuration of Neon

$Ne=1s^2,2s^22p^6$

Silicon = 14 = 2,8,4

The electronic configuration of Silicon

$Si=1s^2,2s^22p^6,3s^23p^2$

Carbon = 6 = 2,4

The electronic configuration of Carbon

$C=1s^2,2s^22p^2$

Two elements Si and C have the same number of valence electron.

Hence, Silicon and Carbon have the same number of valence electron.

Answer 2

Silicon and carbon because they are in the same group in the periodic table