Question

Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements. o

Answer 1

Similarity
Both have a prominent oxidation state of +3
They are involved in filling of (n-2)f orbital
Difference
Lanthanoid are involved in filling of 4f-orbital and actinoid are involved in filling of 5f-orbital
Lanthanoid are non-radioactive in nature except promethium whereas all actinoid series elements are radioactive