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with mass numbers ranging from to , all have half-lives well under an hour. three metastable states are known, all with half-lives under a minute. [ ] electron shell an aluminium atom has electrons, arranged in an electron configuration of [ ne ] s p , [ ] with three electrons beyond a stable noble gas
of aluminium's heavier congeners. aluminium's electropositive behavior, high affinity for oxygen, and highly negative standard electrode potential are all more similar to those of scandium , yttrium , lanthanum , and actinium , which have ds configurations of three valence electrons outside a noble gas...
https://en.wikipedia.org/wiki/Aluminum