Question

Discuss briefly the physical properties of actinoids.

Answer 1

1. Actinoids are silvery-white metals with high melting and boiling points.
2. Except for thorium and americium, they have high densities.
3. All actinoids are radioactive.
4. They exhibit various oxidation states, mostly +3.
5. Ionic radii decrease regularly across the series (actinoid contraction).
6. Most actinoid ions are colored.
7. Actinoids generally show paramagnetic behavior.
8. They are highly electropositive and reactive.