They are placed in a
separate panel at the bottom of the periodic table The
names transition metals and inner transition metals
are often used to refer to the elements of d-and
f-blocks respectively There are mainly four series of the transition metals,
3d series (Sc to Zn), 4d series (Y to Cd), 5d series (La
and Hf to Hg) and 6d series which has Ac and elements
from Rf to Cn The two series of the inner transition
metals; 4f (Ce to Lu) and 5f (Th to Lr) are known as
lanthanoids and actinoids respectively