Symbol	Cf
Atomic number	98
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	Silvery
Color	-

Number of protons	98 p+
Number of neutrons	153 n0
Number of electrons	98 e-

From Wikipedia, the free encyclopediaCalifornium 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).

Phase at STP	Solid
Density	15.1 g/cm3
Atomic weight	251 u

Melting point	1173 K 899.85 °C 1651.73 °F
Boiling point	1743 K 1469.85 °C 2677.73 °F
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.3
Electron affinity	-97.31 kJ/mol
Oxidation states	+2, +3, +4, +5 ()
Ionization energies	608 kJ/mol 1206 kJ/mol 2267 kJ/mol 3599 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f10 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f10 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f10 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 28, 8, 2
Valence electrons	2
Valency electrons	2,3,4
Bohr model	Figure: Shell diagram of Californium (Cf) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Lawrence Berkeley National Laboratory (1950)

CAS Number	7440-71-3
ChemSpider ID	22433
EC number	-
PubChem CID Number	23997