Chemical reactions of the elements

Reaction of actinium with air

Actinium metal tarnishes slowly in air and burns readily to form actinium (III) oxide, Ac2O3.

4Ac + 3O2 → 2Ac2O3

Reaction of actinium with water

Reaction of actinium with the halogens

Reaction of actinium with acids

Reaction of actinium with bases

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actinium atomic number