Q: What are the lanthanides and actinides?

Flexi Says:

• Lanthanides and actinides are elements with unfilled f orbitals.
• Lanthanides are all metals with reactivity similar to group 2 elements.
• Actinides are all radioactive elements.
• Lanthanides are used in optical devices (night vision goggles), petroleum refining, and alloys.
• Actinides are found primarily in applications where their radioactivity can be used to power devices such as cardiac pacemakers.