Lantan

57
La
Skupina
n/a
Perioda
6
Blok
f
Protons
Electrons
Neutrons
57
57
82
General Properties
Vrstno število
57
Atomska teža
138,90547
Mass Number
139
Kategorija
Lantanoidi
Barva
Silver
Radioactive
Ne
From the Greek word lanthanein, to lie hidden
Kristalna struktura
Heksagonalna
Zgodovina
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
Razporeditev elektronov
[Xe] 5d1 6s2
La
Lanthanum is the most reactive of the rare earth metals
Physical Properties
Faza snovi
Trdnina
Gostota
6,145 g/cm3
Tališče
1193,15 K | 920 °C | 1688 °F
Vrelišče
3737,15 K | 3464 °C | 6267,2 °F
Talilna toplota
6,2 kJ/mol
Izparilna toplota
400 kJ/mol
Toplotna kapaciteta
0,195 J/g·K
Abundance in Earth's crust
0,0034%
Abundance in Universe
2×10-7%
Pure
Zasluge za slike: Images-of-elements
Pure lanthanum
CAS Number
7439-91-0
PubChem CID Number
23926
Atomic Properties
Atomski polmer
187 pm
Kovalentni polmer
207 pm
Elektronegativnost
1,1 (Paulingova lestvica)
Ionization Potential
5,5769 eV
Atomic Volume
22,5 cm3/mol
Toplotna prevodnost
0,135 W/cm·K
Oksidacijska stanja
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