The lanthanide contraction is the steady decrease in atomic radius that occurs for the lanthanide elements from cerium to lutetium. This contraction is caused by the poor shielding of the f electrons, which allows the nuclear charge to more strongly attract the outer electrons. The consequences of the lanthanide contraction include slight variations in chemical properties that allow separation of lanthanides, as well as increasing melting and boiling points across the series.

2. INNER
TRANSITION
ELEMENTS

5. LANTHANIDE CONTRACTION
With the increase in atomic number there is a steady decrease in the size of
lanthanides and this regular decrease in the size of lanthanides is called
lanthanide contraction
Cause of lanthanide contraction
1. As atomic number increases one by one, nuclear charge increases and
hence size decreases
2. Poor shielding effect of f electrons result in the nuclear attraction towards the
outer most electron increases result in the contraction of size.

6. Consequences of Lanthanide Contraction
1. lanthanide contraction result in the slight variation in their chemical properties
which helps in the separation of lanthanides from one another by ion
exchange methods.
2. Melting and boiling points of the elements increases from Ce to Lu.
3. Decreasing basicity of

8. THANK YOU