How are valence electrons imoprtant?

Answer:

Valence electrons can determine the reactivity of the atom. An atom with a full shell of valence electrons, like neon, will be less reactive than an atom with only one electron in its valence shell, like sodium.

First answer by Chibixkaede. Last edit by Chibixkaede. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].