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  2. Actinide - Wikipedia

    en.wikipedia.org/wiki/Actinide

    The actinide series derives its name from the first element in the series, actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. [1] [2] [3] The 1985 IUPAC Red Book recommends that actinoid be used rather than actinide, since the suffix -ide normally indicates a negative ion.

  3. Actinide chemistry - Wikipedia

    en.wikipedia.org/wiki/Actinide_chemistry

    The actinides derive their name from the group 3 element actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. All but one of the actinides are f-block elements, corresponding to the filling of the 5f electron shell; lawrencium, a d-block element, is also generally considered an ...

  4. Actinide concept - Wikipedia

    en.wikipedia.org/wiki/Actinide_concept

    The actinide concept explained some of the observed properties of the first few actinides, namely the presence of +4 to +6 oxidation states, and proposed hybridization of the 5f and 6d orbitals, whose electrons were shown to be loosely bound in these elements. It also supported experimental results for a trend towards +3 oxidation states in the ...

  5. Properties of metals, metalloids and nonmetals - Wikipedia

    en.wikipedia.org/wiki/Properties_of_metals...

    The characteristic properties of elemental metals and nonmetals are quite distinct, as shown in the table below. Metalloids, straddling the metal-nonmetal border , are mostly distinct from either, but in a few properties resemble one or the other, as shown in the shading of the metalloid column below and summarized in the small table at the top ...

  6. Thorium compounds - Wikipedia

    en.wikipedia.org/wiki/Thorium_compounds

    While the later actinides from americium onwards are predominantly trivalent and behave more similarly to the corresponding lanthanides, as one would expect from periodic trends, the early actinides up to plutonium (thus including thorium and uranium) have relativistically destabilised and hence delocalised 5f and 6d electrons that participate ...

  7. Main-group element - Wikipedia

    en.wikipedia.org/wiki/Main-group_element

    The position of the actinides is more questionable, but the most common and stable of them, thorium (Th) and uranium (U), are similar to main-group elements as thorium is an electropositive element with only one main oxidation state (+4), and uranium has two main ones separated by two oxidation units (+4 and +6). [3]

  8. Actinium - Wikipedia

    en.wikipedia.org/wiki/Actinium

    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 ...

  9. Category:Actinides - Wikipedia

    en.wikipedia.org/wiki/Category:Actinides

    This page was last edited on 26 September 2014, at 21:24 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.