F-block elements, also known as inner transition elements, are the elements found in the f-block of the periodic table. They include the lanthanide and actinide series of elements. They have some common characteristics such as:
- They have relatively large atomic radii.
- They are highly reactive and tend to form multiple oxidation states.
- They display a range of colors due to their variable oxidation states.
- They have a wide range of physical and chemical properties.
- Most of them are radioactive elements.
- They are typically found in small concentrations in nature.