Key Points
Key Points: The f-Block Elements
- The f-block includes lanthanoids and actinoids.
- Last electron enters the f-orbital.
- General configuration involves (n−2) f orbitals.
- Lanthanoids have atomic numbers 58–71.
- Actinoids have atomic numbers 90–103.
- They show variable oxidation states.
- Actinoids are mostly radioactive.
- They are placed separately to keep the periodic table compact.
