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lanthanum
Image: Wikimedia Commons

lanthanum

Chemical element with symbol La and atomic number 57

Chemical elementchemical elementchemical substanceQ1801

Also known as element 57 · La · 57La · metallic lanthanum

Symbol
Atomic number
Mass
Melting point
  • 1,192 K
Boiling point
  • 3,743 K
Density
  • 6,139.07 kg/m³
Discovered by
Discovered

Overview

All data

189 statements · 19% with external sources · numbers in brackets are citations

Location of discovery
Unicode character
Different from
Electronegativity
  • 1.1
Formula
Canonical SMILES
Part of
Followed by
Named after
  • hiding language: Greek · subject named as: λανθάνειν
Ionic radius
  • 1.03 ångström charge number: 3 · coordination number: 6
  • 1.16 ångström charge number: 3 · coordination number: 8
  • 1.27 ångström charge number: 3 · coordination number: 10
  • 1.36 ångström charge number: 3 · coordination number: 12
Made from material
Show 43 more
Electron configuration
  • 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 5d¹
  • [Xe] 6s² 5d¹
Bulk modulus
  • 25.9B Pa
Shear modulus
  • 16.9B Pa
Poisson's ratio
  • 0.231
Thermal conductivity
  • 13 watt per metre kelvin
Electrical conductivity
  • 1,626,000 siemens per metre
Speed of sound
  • 2,475 m/s
Mohs' hardness
  • 2.5
Has characteristic
Ionization energy
Subclass of
IPA transcription
Oxidation state
  • 3
  • 0
  • 1
  • 2
Crystal system
Atomic radius
  • 195 picometre
Covalent radius
  • 207 picometre

On other databases

61 identifiers linking lanthanum across the web's reference databases