Difference between revisions of "Group 3"

Latest revision as of 15:46, 27 December 2010

Group 3 of the periodic table comprises the elements scandium, yttrium, lanthanum and actinium.^{[Note 1]}^[1] The group 3 elements are, by definition, transition elements:^[2] lanthanum and actinium are usually consider to also belong to the lanthanoids and actinoids respectively.^[2] Scandium, yttrium and lanthanum, but not actinium, are also rare earth elements.^[2]

↑ Other, minority definitions either include the lanthanoids and actinoids in group 3, or substitute lutetium and lawrencium for lanthanum and actinium: there is no basis in periodicity for such changes.

↑ Periodic Table of the Elements; International Union of Pure and Applied Chemistry (IUPAC), <http://old.iupac.org/reports/periodic_table/index.html>. (accessed 25 December 2010).
↑ ^2.0 ^2.1 ^2.2 Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; pp 51–52. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.

See also the corresponding article on Wikipedia.

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-'''Group 3''' of the [[periodic table]] comprises the [[Chemical element|element]]s [[scandium]], [[yttrium]], [[lanthanum]] and [[actinium]].<ref group="Note">Other, minority definitions either include the [[lanthanoid]]s and [[actinoid]]s in group&nbsp;3, or substitute [[lutetium]] and [[lawrencium]] for [[lanthanum]] and [[actinium]]: there is no basis in [[periodicity]] for such changes.</ref><ref>{{IUPAC periodic table}}.</ref> The group&nbsp;3 elements are, by definition, [[transition element]]s.<ref>{{RedBook2005|pages=51–52}}.</ref>
+{{TOCright}}
+'''Group 3''' of the [[periodic table]] comprises the [[Chemical element|element]]s [[scandium]], [[yttrium]], [[lanthanum]] and [[actinium]].<ref group="Note">Other, minority definitions either include the [[lanthanoid]]s and [[actinoid]]s in group&nbsp;3, or substitute [[lutetium]] and [[lawrencium]] for [[lanthanum]] and [[actinium]]: there is no basis in [[periodicity]] for such changes.</ref><ref>{{IUPAC periodic table}}.</ref> The group&nbsp;3 elements are, by definition, [[transition element]]s:<ref name="RedBook">{{RedBook2005|pages=51–52}}.</ref> lanthanum and actinium are usually consider to also belong to the [[lanthanoid]]s and [[actinoid]]s respectively.<ref name="RedBook"/> Scandium, yttrium and lanthanum, but not actinium, are also [[rare earth element]]s.<ref name="RedBook"/>
 ==Notes and references==