Question

Differenes in atomic radii of lanthnoids and actinoids

Answer 1

Lanthanoids cause the atomic radii of elements after them to be much lower than expected, due poor 4f-orbital shielding. This is called lanthanide contractions. Actinoids are all radioactive and most of them are not naturally found on the earth. Both groups have elements mostly in the +3 oxidation state.

Answer 2

Differences between lanthanides and actinides

1. Lanthanides have the ability to show a maximum oxidation state of +4 while actinides show oxidation states of +3, +4, +5, +6 and +7.

2. Lanthanides do not form complexes easily. Actinides have a greater tendency to form complexes with ligands such as thio-ethers.

3. All lanthanides are non-radioactive except promethium but actinides are radioactive in nature.

4. Lanthanides do not form oxocations, but actinides form oxocations such as UO+, PuO+, NpO2+.

5. Most of the lanthanides are colorless in nature but most of the actinides are colored ions.

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