Numford
Oxidation number

Cl in Cl₂O₇

Cl is +7 in dichlorine heptoxide.

Oxidation number

Type a formula or an ion: K2Cr2O7, Cr2O7 2-, MnO4-, NH4+ or K4[Fe(CN)6]. Put a known ion in brackets when two elements are unknown. Pick an element to solve for it.

Cl+7

  1. Oxygen is −2 in most compounds.
  2. The oxidation numbers add up to the charge, 0: 7(−2) + 2x = 0.
  3. 2x = +14, so x = +7.
Rule steps

How to find it

  1. Oxygen is −2 in most compounds.
  2. The oxidation numbers add up to the charge, 0: 7(−2) + 2x = 0.
  3. 2x = +14, so x = +7.
Every atom

All the oxidation numbers in Cl₂O₇

  • O −27 atoms, oxygen
  • Cl +72 atoms, sum rule
Questions

Cl in Cl₂O₇: quick answers

What is the oxidation number of Cl in Cl₂O₇?

Cl in Cl₂O₇ (dichlorine heptoxide) is +7.

How do you find the oxidation number of Cl in Cl₂O₇?

Oxygen is −2 in most compounds. The oxidation numbers add up to the charge, 0: 7(−2) + 2x = 0. 2x = +14, so x = +7.

What are the oxidation numbers of the other atoms in Cl₂O₇?

O −2. Together with Cl at +7 they add up to the charge of the compound, 0.

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