Калифорниум

98
Cf
Група
Нема одговор
Периода
7
блок
f
Protons
Electrons
Neutrons
98
98
153
Општи Својства
Атомски број
98
Атомска тежина
[251]
Mass Number
251
Category
Актиноид
Color
Нема одговор
Radioactive
Да
Named after California and the University of California
Кристална структура
Simple 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.
Electrons per shell
2, 8, 18, 32, 28, 8, 2
Електронска конфигурација
[Rn] 5f10 7s2
Cf
Californium is produced in nuclear reactors and particle accelerators
Физички Својства
Фаза
Solid
Густина
15,1 g/cm3
Точка на топење
1173,15 K | 900 °C | 1652 °F
Точка на вриење
-
Топлина на топење
Нема одговор
Топлина на испарување
Нема одговор
Specific Heat Capacity
-
Abundance in Earth's crust
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Abundance in Universe
Нема одговор
Illustration
Кредити на слика: Images-of-elements
Illustration of californium
CAS Number
7440-71-3
PubChem CID Number
Нема одговор
Атомски Својства
Атомски полупречник
-
Ковалентен полупречник
-
Електронегативност
1,3 (Полингова скала)
Ionization Potential
6,2817 eV
Atomic Volume
18,4 cm3/mol
Thermal Conductivity
0,1 W/cm·K
Oxidation States
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
Isotopes
Stable Isotopes
-
Unstable Isotopes
237Cf, 238Cf, 239Cf, 240Cf, 241Cf, 242Cf, 243Cf, 244Cf, 245Cf, 246Cf, 247Cf, 248Cf, 249Cf, 250Cf, 251Cf, 252Cf, 253Cf, 254Cf, 255Cf, 256Cf