Extension beyond the 7th periodFricke modellarge cellsPyykkö modelSets ofelementsByperiodictablestructureGroups1 (Alkali metals)2 (Alkaline earth metals)3456789101112131415 (Pnictogens)16 (Chalcogens)17 (Halogens)18 (Noble gases)Periods12345678+AufbauFrickePyykköBlockss-blockp-blockd-blockf-blockg-blockAufbau principleBymetallicityMetalsAlkali metalsAlkaline earth metalsLanthanidesActinidesSuperactinidesEka-superactinidesTransition metalsPost-transition metalsMetalloidsLists of metalloids by sourceDividing lineNonmetalsPolyatomic nonmetalsDiatomic nonmetalsNoble gasesOthersetsNutritional elementsPlatinum-group metals (PGM)Rare-earth elementsRefractory metalsPrecious metalsCoinage metalsNoble metalHeavy metalsNative metalsTransuranium elementsTransactinide elementsMajor actinidesMinor actinidesElementsListsBy: Abundance (in humans)Atomic propertiesNuclear stabilityProductionSymbolPropertiesAtomic weightCrys