Electronic configuration of d-block elementsPosition and general characteristics of d-block elementsTransition elements definitionVariable oxidation statesMagnetic propertiesColour of transition metal compoundsFormation of complex compoundsAlloy formationCatalytic properties of transition metalsLanthanoids: electronic configurationoxidation stateslanthanide contractionproperties and usesActinoids: electronic configurationoxidation statesactinide contractioncomparison with lanthanoidsExtraction and separation of lanthanoids and actinoidsOccurrence and uses of d and f block elementsImportant compounds of transition metalsInterstitial compounds