What element has the symbol 'Cf'?

The story behind the answer

The symbol Cf belongs to the element Californium, atomic number 98. It’s a synthetic, highly radioactive actinide discovered in 1950 at UC Berkeley by the team led by Glenn T. Seaborg, and named after the state of California (and the university). Californium-252 is a notable isotope because it emits abundant neutrons, making it valuable for starting nuclear reactors and in neutron radiography.

To remember it: think “CF = California,” as if reading a state abbreviation. The distractors aren’t elements: Californium-252 is just