The Valence electrons are the electrons located at the outermost shell of an atom.
This is because when two atoms interact the outermost electrons touch each other first and determine how the atoms react in a chemical reaction. Valence electrons are in the outermost occupied shell of the atom. They are important because they play a major role in determining the chemical properties of atoms.
Depending on the number of valence electrons in an atom the atom can become unreactive or highly reactive. For reactive atoms, the number of valence electrons determines whether they are likely to lose or gain electrons in chemical reactions. Metals that readily donate electrons can conduct electricity.
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