Actinium(III) oxide

Actinium(III) oxide
Names
	IUPAC name Actinium(III) oxide
	Systematic IUPAC name Actinium(3+) oxide
	Other names Actinium sesquioxide
Identifiers
CAS Number	12002-61-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	10700920;
ECHA InfoCard	100.031.275
EC Number	234-417-6;
PubChem CID	21946271;
CompTox Dashboard (EPA)	DTXSID601029728 ;
	InChI InChI=1S/2Ac.3O/q;;3*-2 [pubchem] Key: MAPOZTWVBAGEOP-UHFFFAOYSA-N [pubchem];
	SMILES [O--].[O--].[O--].[Ac+3].[Ac+3];
Properties
Chemical formula	Ac2O3
Molar mass	502.053 g/mol
Appearance	white
Melting point	2,327 °C (4,221 °F; 2,600 K)
Structure
Crystal structure	Trigonal, hP5
Space group	P3m1, No. 164
Lattice constant	a = 408 pm, c = 630 pm
Related compounds
Other cations	Lanthanum(III) oxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Actinium(III) oxide is a chemical compound containing the rare radioactive element actinium. It has the molecular formula Ac₂O₃. It is similar to its corresponding lanthanum compound, lanthanum(III) oxide, and contains actinium in the oxidation state +3. Actinium oxide is not to be confused with Ac₂O (acetic anhydride), where Ac is an abbreviation for acetyl instead of the symbol of the element actinium.