also found in group 3 of the periodic table, actinides make up the other half of the rare earth metals. all elements in this series are synthetic, which means they were made by humans and not nature. actinides are also all radioactive and thus highly unstable.
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium