Lantano
57
La
Grupo
Neniu
Perio
6
Bloko
f
Protonoj
Elektronoj
Neŭtronoj
57
57
82
Ĝeneralaj Propraĵoj
Atoma Nombro
57
Atommaso
138,90547
Amasa Nombro
139
Kategorio
Lantanoidoj
Koloro
Arĝento
Radioaktiva
Ne
From the Greek word lanthanein, to lie hidden
Kristala Strukturo
Simpla Sesangula
Historio
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.
Elektronoj per ŝelo
2, 8, 18, 18, 9, 2
Elektrona Agordo
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
Fizikaj Propraĵoj
Fazo
Solido
Denso
6,145 g/cm3
Fandpunkto
1193,15 K | 920 °C | 1688 °F
Bolpunkto
3737,15 K | 3464 °C | 6267,2 °F
Varmo de Fuzio
6,2 kJ/mol
Varmo de Vaporiĝo
400 kJ/mol
Specifa Varmo Kapacito
0,195 J/g·K
Krusta Abundo
0,0034%
Universa Abundo
2×10-7%
CAS Nombro
7439-91-0
PubChem Kunmetita Identiga Nombro
23926
Atomaj Propraĵoj
Atoma Radiuso
187 pm
Kovalenta Radiuso
207 pm
Elektronegativeco
1,1 (Pauling-skalo)
Potencialo de jonigo
5,5769 eV
Atoma Volumo
22,5 cm3/mol
Termika Kondukto
0,135 W/cm·K
Oksidaj Ŝtatoj
2, 3
Aplikoj
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
Izotopoj
Stabilaj Izotopoj
139LaMalstabilaj Isotopoj
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