Question
Question: Lanthanoid contraction is due to increase in...
Lanthanoid contraction is due to increase in
A
Atomic number
B
Effective nuclear charge
C
Atomic radius
D
Valence electrons
Answer
Effective nuclear charge
Explanation
Solution
As we move down the lanthanoid series the shielding effect of electrons is very little due to poor shielding of f-orbitals and hence the nuclei charge increase at each step increasing the pull of the electron in wards which results in lanthnoid contraction.