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Actinium (III) oxide is a chemical compound containing the rare radioactive element actinium. It has the formula Ac 2 O 3. It is similar to its corresponding lanthanum compound, lanthanum (III) oxide, and contains actinium in the oxidation state +3. [2][3] Actinium oxide is not to be confused with Ac 2 O (acetic anhydride), where Ac is an ...
Actinide chemistry. Plutonium is a transuranic radioactive chemical element, an actinide metal. Actinide chemistry (or actinoid chemistry) is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides. The actinides derive their name from the group 3 element actinium.
Actinium through nobelium are f-block elements, while lawrencium is a d-block element [5] [6] and a transition metal. [7] The series mostly corresponds to the filling of the 5f electron shell , although as isolated atoms in the ground state many have anomalous configurations involving the filling of the 6d shell due to interelectronic repulsion.
As with most lanthanides and actinides, actinium exists in the oxidation state +3, and the Ac 3+ ions are colorless in solutions. [25] The oxidation state +3 originates from the [Rn] 6d 1 7s 2 electronic configuration of actinium, with three valence electrons that are easily donated to give the stable closed-shell structure of the noble gas ...
Actinide concept. In nuclear chemistry, the actinide concept (also known as actinide hypothesis) proposed that the actinides form a second inner transition series homologous to the lanthanides. Its origins stem from observation of lanthanide-like properties in transuranic elements in contrast to the distinct complex chemistry of previously ...
v. t. e. In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. The lanthanide and actinide elements (the f-block) are called inner transition metals and are sometimes considered to be ...
In chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom if all of its bonds to other atoms were fully ionic. It describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. Conceptually, the oxidation state may be positive, negative or zero. Beside nearly-pure ionic bonding, many ...
Actinium compounds are compounds containing the element actinium (Ac). Due to actinium's intense radioactivity, only a limited number of actinium compounds are known. These include: AcF 3, AcCl 3, AcBr 3, AcOF, AcOCl, AcOBr, Ac 2 S 3, Ac 2 O 3, AcPO 4 and Ac (NO 3) 3. Except for AcPO 4, they are all similar to the corresponding lanthanum compounds.
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