Lanthanide contraction
= Lanthanide contraction
The reduction in size across the lanthanide series associated with incomplete screening by $4f$ electrons; it contributes to size similarities and contractions in subsequent $5d$ elements.
= Lanthanide contraction
The reduction in size across the lanthanide series associated with incomplete screening by $4f$ electrons; it contributes to size similarities and contractions in subsequent $5d$ elements.