Reason of lanthanide contraction is
A. negligble sereening effect of f-orbital
B. increasing unuclear charge
C. decreasing nuclear charge
D. decreasing screening effect
A. negligble sereening effect of f-orbital
B. increasing unuclear charge
C. decreasing nuclear charge
D. decreasing screening effect
Correct Answer – A
On account of poor shielding effect of `f`-electrons, nucleus exerts a strong attraction as atomic number increase and thus size of atom decrease.