What is the oxidation number of chlorine?

1 Answer
Nov 1, 2015

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 #"Cl"_2#).

But chlorine can have other oxidation numbers, for example:

  • +1 in #"NaClO"#
  • +3 in #"NaClO"_2#
  • +4 in #"ClO"_2#
  • +5 in #"NaClO"_3#
  • +7 in #"NaClO"_4#