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Oxidation Numbers

Oxidation numbers is a fictitious charge we assign to an atom in a compound. It can be used to determine if a redox reaction occurs, and oxidizing and reducing agents.

  • Oxidation numbers of pure elements is 0.
  • The oxidation number of H is usually +1.
  • The oxidation number of O is usually -2.
  • Halogens usually have an oxidation number of -1.
  • Alkali metals usually have an oxidation number of +1.
  • The oxidation numbers in a compound always add to 0.
  • Polyatomic ions may carry an overall oxidation number based on their charge.

Solution

Considering the rules mentioned above, we can determine the oxidation numbers of the given substances:

A) Mn ⇒ 0

B) MnF₂ ⇒ +2 for Mg, -1 for F

C) Mn₃(PO₄)₂ ⇒ +6 for Mg, -3 for PO₄³⁻

D) MnCl₂ ⇒ +2 for Mg, -1 for Cl

E) NaMnO₄ ⇒ +1 for Na, +7 for Mn, -2 for O₄

Therefore, NaMnO₄ contains manganese with the highest oxidation number.

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