Lantan
57
La
Skupina
n/a
Perioda
6
Blok
f
Protoni
Elektroni
Neutroni
57
57
82
Opća svojstva
Atomski broj
57
Relativna atomska masa
138,90547
Maseni broj
139
Kategorija
Lantanoidi
Boja
Srebrna
Radioaktivan
Ne
Od grčke riječi lanthanein, ležati sakriven
Kristalna struktura
Jednostavna heksagonska
Povijest
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.
Elektrona po ljusci
2, 8, 18, 18, 9, 2
Elektronska konfiguracija
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
6,145 g/cm3
Talište
1193,15 K | 920 °C | 1688 °F
Vrelište
3737,15 K | 3464 °C | 6267,2 °F
Toplina taljenja
6,2 kJ/mol
Toplina isparavanja
400 kJ/mol
Specifični toplinski kapacitet
0,195 J/g·K
Zastupljenost u Zemljinoj kori
0,0034%
Zastupljenost u svemiru
2×10-7%
CAS broj
7439-91-0
PubChem CID broj
23926
Atomska svojstva
Atomski radijus
187 pm
Kovalentni radijus
207 pm
Elektronegativnost
1,1 (Paulingova ljestvica)
Potencijal ionizacije
5,5769 eV
Atomski volumen
22,5 cm3/mol
Toplinska vodljivost
0,135 W/cm·K
Stanja oksidacije
2, 3
Primjene
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
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