The elements lanthanum to Lutessium is lanthanides. Actinium to lawrencium is actinides. Both element shows contraction. That means sudden reduction of atomic radius. The cause of contraction is shielding effect of 4f orbital in lanthanides and 5f orbital in actinides.
Shielding effect by 5f orbital is very poor than shielding effect by 4f orbital. Because, 5f orbital is more diffuse and extended and out spread. Hence, actinides can form covalent compound.
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