Цериум

58
Ce
Група
Нема одговор
Периода
6
блок
f
Protons
Electrons
Neutrons
58
58
82
Општи Својства
Атомски број
58
Атомска тежина
140,116
Mass Number
140
Category
Ланта­ноид
Color
Silver
Radioactive
Не
Cerium was named for the asteroid Ceres
Кристална структура
Simple Hexagonal
History
Jöns Jakob Berzelius and Wilhelm Hisinger discovered the element in ceria in 1803 in Sweden.

Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.

Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
Electrons per shell
2, 8, 18, 19, 9, 2
Електронска конфигурација
[Xe] 4f1 5d1 6s2
Ce
Seawater contains 1.5 parts per trillion of cerium
Физички Својства
Фаза
Solid
Густина
6,77 g/cm3
Точка на топење
1068,15 K | 795 °C | 1463 °F
Точка на вриење
3716,15 K | 3443 °C | 6229,4 °F
Топлина на топење
5,5 kJ/mol
Топлина на испарување
350 kJ/mol
Specific Heat Capacity
0,192 J/g·K
Abundance in Earth's crust
0,006%
Abundance in Universe
1×10-6%
Ultrapure
Кредити на слика: Images-of-elements
Ultrapure cerium under argon
CAS Number
7440-45-1
PubChem CID Number
23974
Атомски Својства
Атомски полупречник
182 pm
Ковалентен полупречник
204 pm
Електронегативност
1,12 (Полингова скала)
Ionization Potential
5,5387 eV
Atomic Volume
20,67 cm3/mol
Thermal Conductivity
0,114 W/cm·K
Oxidation States
2, 3, 4
Applications
Cerium is used in carbon-arc lighting, especially in the motion picture industry.

Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.

Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium is considered to be moderately toxic
Isotopes
Stable Isotopes
136Ce, 138Ce, 140Ce, 142Ce
Unstable Isotopes
119Ce, 120Ce, 121Ce, 122Ce, 123Ce, 124Ce, 125Ce, 126Ce, 127Ce, 128Ce, 129Ce, 130Ce, 131Ce, 132Ce, 133Ce, 134Ce, 135Ce, 137Ce, 139Ce, 141Ce, 143Ce, 144Ce, 145Ce, 146Ce, 147Ce, 148Ce, 149Ce, 150Ce, 151Ce, 152Ce, 153Ce, 154Ce, 155Ce, 156Ce, 157Ce