Lanthanum (La)

General Properties

Symbol La
Atomic Number 57
Atomic Weight 138.90547
Group
3 (scandium family)
IIIA (IUPAC), IIIB (CAS)
Solid, Conductor, Lanthanide, Stable, Natural
Period 6
Block f

Physical Properties

Density 6.15 g/cm3
Atomic Volume 22.5 cm3/mole
Atomic Radius 1.38 angstroms
Covalent Radius 169 pm
Crust Abundance 0.0034%
Crystal Structure Hexagonal
Color Silver

Energy

Electronegativity 1.1 (Pauling Scale)
Electron Affinity 48 kJ/mol
1st Ionization Energy 538 kJ/mol
2nd Ionization Energy 1067 kJ/mol
3rd Ionization Energy 1850.3 kJ/mol
4th Ionization Energy 4819 kJ/mol
5th Ionization Energy 5940 kJ/mol
Specific Heat Capacity 0.19 J g−1 K−1
Thermal Conductivity 13.5 W·m−1·K−1

Electrons & Oxidation

Oxidation States 3
Electrons Per Shell 2 8 18 18 9 2
Electron Configuration [Xe] 5d1 6s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
 
 
 
 
 
 
 
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
↿ 
 
 
 
 
5f
 
 
 
 
 
 
 
6s
↿⇂
6p
 
 
 
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 

Nuclear

Radioactive No

Media

Planetary Bohr Model of Lanthanum (La)
Description
Soft, silvery-white, malleable, ductile metal.
Uses
It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses.
Sources
Found with rare earths in monazite and bastnasite. Monazite sand typicall contains 25% lanthanum.
Pronounciation (English)
LAN-the-nem

Translations

Afrikaans Lantaan
Aragonese Lantán
العربية لنثانوم
Armãneashte Lantan
asturianu Lantanu
azərbaycan dili Lantan
български Лантан
বাংলা ল্যান্থানাম
brezhoneg Lantan
bosanski Lanthanum, ²Lantan
Byelorussian Лантан
Cebuano Lantano
čeština Lanthan
Chuvash Лантан
Cymraeg Lantani
dansk Lanthan
Deutsch Lanthan
Ελληνικά Λανθανιο
English Lanthanum
esperanto Lantano
español Lantano
eesti Lantaan
euskara Lantanoa
فارسی لانتانوم
suomi Lantaani
føroyskt Lanthan
français Lanthane
furlan Lantani
West-Frysk Lanthaan
Gaeilge Lantainam
Gàidhlig Lantanam
galego Lantano
ગુજરાતી લૅન્થેનમનો
Gaelg Lantanum
Hakka Chinese Làn (碲)
עברית לנתן
हिन्दी लाञ्थनम
hrvatski Lantan
magyar Lantán
հայերեն Լանթան
Indonesia Lantanium
íslenska Lantan, ²Lanþan
italiano Lantanio
日本語 ランタン
ქართული ლანთანი
کٲشُر Lantón
қазақ тілі Лантан
한국어 란탄, 2란타넘
Kurdish Lantan
Komi Лантан
kernewek Lanthanum
кыргызча Лантан
Latin Lanthanum
Lëtzebuergesch Lanthan
Lombard Lantàni
lingála Lantani
lietuvių Lantanas
latviešu Lantāns
Mari Лантан
Maori Lanthanum
македонски Лантан
മലയാളം ലാന്തനം
монгол Лантан
Мокшан Лантан
Bahasa Melayu Lanthanum
Malti Lantanum, ²Lantanju
Nahuatl Lantano
Nederlands Lanthaan
norsk Lantan
Occitan Lantan
ирон Лантан
polski Lantan
português Lantâno
Runasimi Lanthanu
română Lantan
русский Лантан
slovenčina Lantán
slovenščina Lantan
Samoan Lantanimi
Samogitian Lantans
shqip Lantan, ²Lanthani
српски Лантан
Southern Sotho Lantanamo
svenska Lantan
Kiswahili Lanthani
தமிழ் லந்தானம்
Tajik Лантан
ไทย แลนทานัม
Türkçe Lantan
ئۇيغۇرچە لانتان
українська Лантан
o‘zbek Lantan
Tiếng Việt Lantan
Võro Lantaan
中文

History

Discovered In
1839
Discovered By
Carl Gustaf Mosander
Discovered At
Sweden
Word Origin
From the Greek word "lanthanein" meaning "to lie hidden"