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Chlorine atom has 17 electrons. It<span> has seven </span>valence electrons<span>. These seven electrons make </span>chlorine<span> a very reactive element. A </span>valence electron<span> is an </span>electron<span> that is associated with an atom, and that can participate in the formation of a chemical bond. Hope this helps.</span>
Hydrogen is oxidized. The H2 reactant has an oxidation number of 0 because it’s in its elemental form. In the H2O product, H has an oxidation number of +1. The increase in oxidation number is oxidation.