Californium (Cf), element 98 – Learn Acer periodic table

Californium

Actinide, atomic number 98.

Californium is a radioactive metallic chemical element with symbol Cf and atomic number 98. The element was first made in 1950 at the University of California Radiation Laboratory in Berkeley, by bombarding curium with alpha particles (helium-4 ions). It is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium).

Facts

Symbol Cf. Atomic mass 251.0 u. Group 3, period 7. Electron configuration [Rn] 5f10 7s2. Electrons per shell 2, 8, 18, 32, 28, 8, 2. State at room temperature: Solid. Melting point 899.9 °C, boiling point 1469.8 °C. Discovered by Lawrence Berkeley National Laboratory.

Element data from Wikipedia, CC BY-SA 3.0.