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Britannica Sources used in this answer

Which chlorine ions have oxidation states of +1, +3, +5, and +7?

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A labeled diagram of the chlorine element from the periodic table shows its atomic number 17, symbol Cl, electron configuration, and atomic weight range. The box is shaded green to indicate chlorine is a halogen, with icons for orthorhombic crystal structure, gas state at room temperature, and strong acidity. A key explains the icons and colors used.
chlorine Properties of chlorine.

Chlorine exhibits oxidation states of +1, +3, +5, and +7 in the following ions:

  • +1: Hypochlorite ion (ClO⁻)
  • +3: Chlorite ion (ClO₂⁻)
  • +5: Chlorate ion (ClO₃⁻)
  • +7: Perchlorate ion (ClO₄⁻)

These oxidation states are typically stabilized through coordination with oxygen, where the bonding is predominantly covalent.1