The elements in groups 3 through 12 are the transition metals. The transition elements are subdivided into two types: actinides and lanthanides. While actinides are elements with the atomic numbers that run from 89 to 103, lanthanides are elements with atomic numbers 57 through 71.
The transition metals are good electrical conductors, hard and malleable. They also have high boiling and melting points, and positive oxidation states. Some common elements that are transition metals are iron, titanium, scandium, nickel, copper, zinc and uranium. Some transition metals like copper, titanium and iron are very important because they form many different alloys that are useful in different industries. Most of the transitions metals tend to form stable compounds.