1. Iron (Fe): Fe(II) (ferrous) and Fe(III) (ferric)
2. Copper (Cu): Cu(I) (cuprous) and Cu(II) (cupric)
3. Manganese (Mn): Mn(II), Mn(III), Mn(IV), Mn(VII) (permanganate)
4. Chromium (Cr): Cr(II), Cr(III), Cr(VI)
5. Gold (Au): Au(I) (aurous) and Au(III) (auric)
Transition metals often exhibit multiple oxidation states due to the presence of d electrons in their outer shell, which can participate in bonding in various ways.