The elements in group 0 are known as noble gases. They are very unreactive and exist as individual atoms (monatomic). The transition metals are elements which are found between groups 2 and 3.

Most catalysts are, like the platinum catalyst in cars, based on highly precious transition metals. Professor Harder’s mission is to show that cheap and widely available main group metals can also do ...

As you go down the group the halogens become less reactive. The transition metals are elements which are found between groups 2 and 3. Well known examples are iron, copper and gold. They are ...