Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr). Oxygen, like all the other elements in group 16, has six valence electrons.Nov 1, 2012
Helium and Beryllium has two valance electrons.
In chemistry and physics, a valance electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.
The electron configuration of Helium is a 2. The electron configuration of Beryllium is 2,2 Helium is inert because it's outer electron has four electrons. the first two are in the inner orbit and the other two are in the outer orbit that can hold eight electrons.
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