Californium

98
Cf
Gruppe
n/a
Periode
7
Blok
f
Protons
Electrons
Neutrons
98
98
153
General Properties
Atomnummer
98
Atommasse
[251]
Mass Number
251
Kategori
Actinider
Farve
n/a
Radioactive
Ja
Named after California and the University of California
Krystalstruktur
Simpel Hexagonal
History
Californium was discovered by Stanley G. Thompson, Kenneth Street, Jr., Albert Ghiorso and Glenn T. Seaborg in 1950 at the University of California, Berkeley.

It was produced by the bombardment of curium with alpha particles.

Californium was isolated in macro quantities for the first time by Burris Cunningham and Stanley Thompson in 1958.
Elektroner i hver skal
2, 8, 18, 32, 28, 8, 2
Elektronkonfiguration
[Rn] 5f10 7s2
Cf
Californium is produced in nuclear reactors and particle accelerators
Physical Properties
Tilstandsform
Fast stof
Massefylde
15,1 g/cm3
Smeltepunkt
1173,15 K | 900 °C | 1652 °F
Kogepunkt
-
Smeltevarme
n/a
Fordampningsvarme
n/a
Varmefylde
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Illustration
Billede akkrediteringer: Images-of-elements
Illustration of californium
CAS Number
7440-71-3
PubChem CID Number
n/a
Atomic Properties
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Paulings skala)
Ionization Potential
6,2817 eV
Atomic Volume
18,4 cm3/mol
Varmeledningsevne
0,1 W/cm·K
Oxidationstrin
2, 3, 4
Applications
Californium is used as a portable neutron source for discovery of metals such as gold or silver by on-the-spot activation analysis.

Neutrons from californium are employed as a treatment of certain cervical and brain cancers where other radiation therapy is ineffective.

Neutron moisture gauges use californium-252 to find water and petroleum layers in oil wells.
Californium is harmful due to its radioactivity
Isotoper
Stable Isotopes
-
Unstable Isotopes
237Cf, 238Cf, 239Cf, 240Cf, 241Cf, 242Cf, 243Cf, 244Cf, 245Cf, 246Cf, 247Cf, 248Cf, 249Cf, 250Cf, 251Cf, 252Cf, 253Cf, 254Cf, 255Cf, 256Cf