The involvement of (n–1) d electrons
in the behaviour of transition elements impart certain distinct characteristics to these
elements Thus, in addition to variable oxidation states, they exhibit paramagnetic
behaviour, catalytic properties and tendency for the formation of coloured ions, interstitial
compounds and complexes The transition elements vary widely in their chemical behaviour Many of them are
sufficiently electropositive to dissolve in mineral acids, although a few are ‘noble’