Lantaan
57
La
Groep
n/a
Periode
6
Blok
f
Protrone
Elektrone
Neutrone
57
57
82
Algemene Eienskappe
Atoom Nommer
57
Atoommassa
138,90547
Massa Nommer
139
Kategorie
Lantaniede
Kleur
Silver
Radioaktief
Nee
From the Greek word lanthanein, to lie hidden
Kristalstruktuur
Eenvoudige seshoekige
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 18, 9, 2
Elektronkonfigurasie
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
Fisiese Eienskappe
Fase
Soliede
Digtheid
6,145 g/cm3
Smeltpunt
1193,15 K | 920 °C | 1688 °F
Kookpunt
3737,15 K | 3464 °C | 6267,2 °F
Heat of Fusion
6,2 kJ/mol
Heat of Vaporization
400 kJ/mol
Spesifieke Hitte Kapasiteit
0,195 J/g·K
Oorvloed in die aardkors
0,0034%
Oorvloed in die heelal
2×10-7%
CAS Nommer
7439-91-0
PubChem CID Nommer
23926
Atomiese Eienskappe
Atoom radius
187 pm
Kovalente Radius
207 pm
Elektronegatiewiteit
1,1 (Pauling scale)
Ionisasie potensiaal
5,5769 eV
Atoom volume
22,5 cm3/mol
Termiese geleidingsvermoë
0,135 W/cm·K
Oksidasiestate
2, 3
Toepassings
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
Isotope
Stabiele Isotope
139LaOnstabiele Isotope
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