The periodic table/Actinoids

These elements are very unstable and used in nuclear power plants. Only Uranium and Thorium exist in nature

List of Actinoids:
 * Actinium
 * Thorium
 * Protactinium
 * Uranium
 * Neptunium
 * Plutonium
 * Americium
 * Curium
 * Berkelium
 * Californium
 * Einsteinium
 * Fermium
 * Mendelevium
 * Nobelium
 * Lawrencium