The oxidation number of chlorine can be -1, 0, +1, +3, +4, +5, or +7.
The total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.
The oxidation number of chlorine can be -1, 0, +1, +3, +4, +5, or +7, depending on the substance containing the chlorine. The most common oxidation numbers are -1 (as in HCl and NaCl ) and 0 (as in Cl2 ).
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