In chemistry, valency is the power of an atom of an element to combine with other atoms measured by the number of electrons which an atom will give, take, or share to form a chemical compound. This is related to the number of spaces left in an atom's electron shells, which is why the only elements with valencies of zero are the noble gases.
In chemistry, valence electrons are the electrons contained in the valence shell (the outermost electron level) of an atom, and which are likely to participate in a chemical reaction through bonding with other atoms, molecules, or ions.
The number of valence electrons in an atom determines the chemical properties of that element; therefore, elements with the same number of valence electrons have very similar chemical properties.
Valence electrons are also shared between atoms or ions to form chemical bonds.
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