- Actinium@ (4)
- Americium@ (4)
- Berkelium@ (4)
- Californium@ (3)
- Curium@ (4)
- Einsteinium@ (3)
- Fermium@ (3)
- Lawrencium@ (3)
- Mendelevium@ (4)
- Neptunium@ (3)
- Nobelium@ (3)
- Plutonium@ (3)
- Protactinium@ (3)
- Thorium@ (4)
- Uranium@ (3)
- UNDERSTANDING the periodic table, with its assemblage of columns and rows of elements, has been a perennial challenge for chemistry students. (See the below.) Understanding at the atomic level a remarkable row of elements has been a particular research challenge for Lawrence Livermore scientists over the years. That row is called the actinides, a collection of 14 radioactive elements named after ...www.llnl.gov/str/Terminello.html