Actinium(III) oxide is a

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

containing the rare radioactive element

actinium Actinium is a chemical element; it has chemical symbol, symbol Ac and atomic number 89. It was discovered by Friedrich Oskar Giesel in 1902, who gave it the name ''emanium''; the element got its name by being wrongly identified with a substa ...

. It has the

molecular formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as paren ...

Ac₂O₃. It is similar to its corresponding

lanthanum Lanthanum is a chemical element; it has symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements bet ...

compound,

lanthanum(III) oxide Lanthanum(III) oxide, also known as lanthana, chemical formula , is an inorganic compound containing the rare earth element lanthanum and oxygen. It is used in some ferroelectric materials, as a component of optical materials, and is a feedstock ...

, and contains actinium in the

oxidation state In chemistry, the oxidation state, or oxidation number, is the hypothetical Electrical charge, charge of an atom if all of its Chemical bond, bonds to other atoms are fully Ionic bond, ionic. It describes the degree of oxidation (loss of electrons ...

+3.Actinium

Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; , ''BSE'') is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Great Russian Enc ...

(in Russian) Actinium oxide is not to be confused with Ac₂O (

acetic anhydride Acetic anhydride, or ethanoic anhydride, is the chemical compound with the chemical formula, formula . Commonly abbreviated , it is one the simplest organic acid anhydride, anhydrides of a carboxylic acid and is widely used in the production of c ...

), where Ac is an abbreviation for acetyl instead of the symbol of the element actinium.

Reactions

* Ac₂O₃ + 6HF → 2AcF₃ + 3H₂O * Ac₂O₃ + 6HCl → 2AcCl₃ + 3H₂O * 4Ac(NO₃)₃ → 2Ac₂O₃ + 12NO₂ + 3O₂ * 4Ac + 3O₂ → 2Ac₂O₃ * Ac₂O₃ + 2AlBr₃ → 2AcBr₃ + Al₂O₃ * 2Ac(OH)₃ → Ac₂O₃ + 3H₂O * Ac₂(C₂O₄)₃ → Ac₂O₃ + 3CO₂ + 3CO * Ac₂O₃ + 3H₂S → Ac₂S₃ + 3H₂O

References

Actinium compounds Sesquioxides {{inorganic-compound-stub