Lantan

57
La
Grupp
n/a
Period
6
Block
f
Protoner
Elektroner
Neutroner
57
57
82
Generella Egenskaper
Atomnummer
57
Atommassa
138,90547
Masstal
139
Kategori
Lantanoider
Färg
Silver
Radioaktiv
Nej
From the Greek word lanthanein, to lie hidden
Kristallstruktur
Enkelt hexagonalt
Historia
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.
Elektroner per skal
2, 8, 18, 18, 9, 2
Elektronkonfiguration
[Xe] 5d1 6s2
La
Lanthanum is the most reactive of the rare earth metals
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
6,145 g/cm3
Smältpunkt
1193,15 K | 920 °C | 1688 °F
Kokpunkt
3737,15 K | 3464 °C | 6267,2 °F
Smältvärme
6,2 kJ/mol
Ångbildningsvärme
400 kJ/mol
Specifik värmekapacitet
0,195 J/g·K
Abundance in Earth's crust
0,0034%
Abundance in Universe
2×10-7%
Pure
Bildkrediter: Images-of-elements
Pure lanthanum
CAS Number
7439-91-0
PubChem CID Number
23926
Atomära Egenskaper
Atomradie
187 pm
Kovalent radie
207 pm
Elektronegativitet
1,1 (Paulingskalan)
Jonisationspotential
5,5769 eV
Molvolym
22,5 cm3/mol
Värmeledningsförmåga
0,135 W/cm·K
Oxidationstillstånd
2, 3
Användningsområden
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
Isotoper
Stabila isotoper
139La
Instabila isotoper
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