Lantan
57
La
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
57
57
82
Splošne lastnosti
Vrstno število
57
Atomska teža
138,90547
Masno število
139
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
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.
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.
Elektroni po lupinah
2, 8, 18, 18, 9, 2
Razporeditev elektronov
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
Fizikalne lastnosti
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
Zastopanost v Zemljini skorji
0,0034%
Zastopanost v vesolju
2×10-7%
CAS številka
7439-91-0
PubChem CID številka
23926
Atomske lastnosti
Atomski polmer
187 pm
Kovalentni polmer
207 pm
Elektronegativnost
1,1 (Paulingova lestvica)
Ionizacijski potencial
5,5769 eV
Atomski volumen
22,5 cm3/mol
Toplotna prevodnost
0,135 W/cm·K
Oksidacijska stanja
2, 3
Uporabe
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.
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
Izotopi
Stabilni izotopi
139LaNestabilni izotopi
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