Position of transition metals in the Periodic Table

The collection of elements between groups 2 and 3, particularly from period 4, located between calcium and gallium together with those directly below them are called transition metals. They are also known

heavy metals because their densities are much higher than those of alkali metals and alkaline earth metals. Only a few other main group metals, such as tin and lead, have comparable densities. The elements

Scandium to zinc constitutes the first transition series.