Californium

Californium (symbol Cf) is a chemical element, atomic number 98 on the periodic table.

Characteristics and history
Californium, in its most stable form, has an atomic mass of 251. Californium was discovered by Humans on Earth's North American continent for the first time by scientists working in the United States in the year 1950. This element is part of the actinide series of heavy elements, and was named for the state of California.