and 
.
(ii) Trends
in the stability of oxo salts of lanthanoids from La to Lu.
(iii) Stability
of the complexes of lanthanoids.
(iv) Radii
of 4cf and 5d block elements.
(v) Trends in acidic
character of lanthanoid oxides.
Answer:
(i) As the size
decreases covalent character increases. Therefore, 
is
more ionic and
is more covalent.
(ii) As the
size decreases from La to Lu, stability of oxo salts also decreases.
(iii) Stability
of complexes increases as the size of lanthanoids decreases.
(iv) Radii
of 4d and 5d - block elements will be almost same.
(v) Acidic character
of oxides increases from La to Lu.
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