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Actinium (Ac) stands out from the others. Unlike its heavier neighbors, Actinium has a mostly filled outer shell, with electrons in the 6d and 7s subshells ([Rn] 6d¹ 7s²). This configuration, closer to noble gases, hints at some stability, but the presence of an electron in the 6d subshell suggests Actinium might be slightly more reactive than a true noble gas
