Lantan
57
La
Guruh
Nomaʼlum
Davr
6
Block
f
Protonlar
Elektronlar
Neytronlar
57
57
82
General Properties
Atom raqami
57
Atom massasi
138,90547
Mass Number
139
Turkum
Lantanoidlar
Ranggi
Silver
Radioaktivlik
Yoʻq
From the Greek word lanthanein, to lie hidden
Crystal Structure
Simple Hexagonal
Tarix
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.
Electrons per shell
2, 8, 18, 18, 9, 2
Elektron konfiguratsiyasi
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
Physical Properties
Phase
Qattiq modda
Zichlik
6,145 g/cm3
Erish harorati
1193,15 K | 920 °C | 1688 °F
Qaynash harorati
3737,15 K | 3464 °C | 6267,2 °F
Heat of Fusion
6,2 kJ/mol
Heat of Vaporization
400 kJ/mol
Solishtirma issiqlik sigʻimi
0,195 J/g·K
Abundance in Earth's crust
0,0034%
Abundance in Universe
2×10-7%
CAS Number
7439-91-0
PubChem CID Number
23926
Atomic Properties
Atom radiusi
187 pm
Kovalentlik radiusi
207 pm
Elektrmanfiylik
1,1 (Poling boʻyicha)
Ionization Potential
5,5769 eV
Molyar hajm
22,5 cm3/mol
Issiqlik oʻtkazuvchanlik
0,135 W/cm·K
Oksidlanish darajasi
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.
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
Izotoplar
Barqaror izotoplar
139LaBeqaror izotoplar
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