1. Californium definition, a transuranic element

2. Berkelium definition, a transuranic element

3. Californium definition: a metallic transuranic element artificially produced from curium

4. Plutonium was the second transuranic element of the actinide series to be discovered.

5. Americium definition: a white metallic transuranic element artificially produced from plutonium

6. Americium definition, a transuranic element, one of the products of high-energy helium bombardment of uranium and plutonium

7. What does Americium mean? A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 232 to 247