Question

Write the consequences of lanthanide contraction?

Answer 1

The consequences of lanthanide contraction:
a) Basic character decreases from $L{a}^{3+}$ to $L{u}^{3+}$.
b) The atomic size of post lanthanoid elements ($Hf,Ta,W$, etc.) is similar to that of the elements of the previous period.
For example, $Hf$ and $Zr$ have same atomic size. $Ta$ and $Nb$ have same atomic size.