Лантан

57
La
Група
Нема одговор
Периода
6
блок
f
Protons
Electrons
Neutrons
57
57
82
Општи Својства
Атомски број
57
Атомска тежина
138,90547
Mass Number
139
Category
Ланта­ноид
Color
Silver
Radioactive
Не
From the Greek word lanthanein, to lie hidden
Кристална структура
Simple Hexagonal
History
Lanthanum was discovered in 1839 by Swedish chemist Carl Gustav Mosander.

He partially decomposed a sample of cerium nitrate by heating and treating the resulting salt with dilute nitric acid.

From the resulting solution, he obtained a pale brick colored oxide of the new rare earth.

Lanthanum was isolated in relatively pure form in 1923.
Electrons per shell
2, 8, 18, 18, 9, 2
Електронска конфигурација
[Xe] 5d1 6s2
La
Lanthanum is the most reactive of the rare earth metals
Физички Својства
Фаза
Solid
Густина
6,145 g/cm3
Точка на топење
1193,15 K | 920 °C | 1688 °F
Точка на вриење
3737,15 K | 3464 °C | 6267,2 °F
Топлина на топење
6,2 kJ/mol
Топлина на испарување
400 kJ/mol
Specific Heat Capacity
0,195 J/g·K
Abundance in Earth's crust
0,0034%
Abundance in Universe
2×10-7%
Pure
Кредити на слика: Images-of-elements
Pure lanthanum
CAS Number
7439-91-0
PubChem CID Number
23926
Атомски Својства
Атомски полупречник
187 pm
Ковалентен полупречник
207 pm
Електронегативност
1,1 (Полингова скала)
Ionization Potential
5,5769 eV
Atomic Volume
22,5 cm3/mol
Thermal Conductivity
0,135 W/cm·K
Oxidation States
2, 3
Applications
Lanthanum is used in large quantities in batteries for hybrid automobiles.

It is also used to make night vision goggles.

Small amounts of lanthanum, as an additive, can be used to produce nodular cast iron.

Lanthanum carbonate is used to reduce blood levels of phosphate in patients with kidney disease.
Lanthanum and its compounds are considered to be moderately toxic
Isotopes
Stable Isotopes
139La
Unstable Isotopes
117La, 118La, 119La, 120La, 121La, 122La, 123La, 124La, 125La, 126La, 127La, 128La, 129La, 130La, 131La, 132La, 133La, 134La, 135La, 136La, 137La, 138La, 140La, 141La, 142La, 143La, 144La, 145La, 146La, 147La, 148La, 149La, 150La, 151La, 152La, 153La, 154La, 155La