TheÀwọn '''alkalimẹ́tàlì metalsálkálì''' are ani [[group (periodic table)|groupegbe]] inkan thelori [[periodic table|tabili idasiko awon elimenti]] consistingto ofni theawon [[chemical element|elimenti]]s [[lithium]] (Li), [[sodium]] (Na), [[potassium]] (K), [[rubidium]] (Rb), [[caesium]] (Cs),{{#tag:ref|''Caesium'' is the spelling recommended by the [[International Union of Pure and Applied Chemistry]] (IUPAC).<ref>{{RedBook2005|pages=248–49}}.</ref> The [[American Chemical Society]] (ACS) has used the spelling ''cesium'' since 1921,<ref>{{Cite book | editor1-first = Anne M. | editor1-last = Coghill | editor2-first = Lorrin R. | editor2-last = Garson | year = 2006 | title = The ACS Style Guide: Effective Communication of Scientific Information | edition = 3rd | publisher = American Chemical Society | location = Washington, D.C. | isbn = 0-8412-3999-1 | page = 127}}.</ref><ref>{{Cite journal | journal=Pure Appl. Chem. | volume=70 | issue=1 | last1=Coplen | pages = 237–257 | year = 1998 | first1=T. B. | url = http://old.iupac.org/reports/1998/7001coplen/history.pdf | last2=Peiser | first2=H. S. | title = History of the recommended atomic-weight values from 1882 to 1997: a comparison of differences from current values to the estimated uncertainties of earlier values | doi = 10.1351/pac199870010237}}.</ref> following ''Webster’s Third New International Dictionary''.|group=note}} andati [[francium]] (Fr) ninu.<ref name="redbook">{{RedBook2005|pages=51}}.</ref> ThisEgbe groupyi lieswa inni theinu [[s-block]] oflori thetabili periodic tableidasiko<ref name="meta-synthesis3">{{cite web |url=http://www.meta-synthesis.com/webbook/35_pt/pt_database.php?Button=1900-1949+Formulations |title=The Internet Database of Periodic Tables |author=Leach, Mark R. |date=1999–2012 |work=meta-synthesis.com |accessdate=20 May 2012}}</ref> asnitoripe allgbogbo alkaliawon metalsmetali alkali haveni theirelektronu outermostode electronwon inni aninu [[atomic orbital|s-orbital]].<ref name="rsc"/><ref>{{cite web |url=http://www.nist.gov/pml/data/upload/periodic_table_composite_2010_nobleed.pdf |title=Periodic Table: Atomic Properties of the Elements |date=September 2010 |work=nist.gov |publisher=[[National Institute of Standards and Technology]] |accessdate=17 February 2012}}</ref><ref name="RubberBible84th"/> TheAwon metali alkali metalsni provide the best example ofapere [[periodic trends|groupijora trendsegbe]] inbi propertiesawon inini thelori periodictabili tableidasiko,<ref name="rsc" /> withpelu elementsawon exhibitingelimenti well-characterizedinu ti won unwuwa [[homology (chemistry)|homologousisejora]] behaviour.<ref name="rsc"/>
