Which two elements have the same number of valence electrons?

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

Neon = 10 = 2,8

The electronic configuration of Neon

Silicon = 14 = 2,8,4

The electronic configuration of Silicon

Carbon = 6 = 2,4

The electronic configuration of Carbon

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

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

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