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thulium
Image: Wikimedia Commons

thulium

Chemical element with symbol Tm and atomic number 69

Chemical elementchemical elementQ1853

Also known as Tm · element 69 · 69Tm

Symbol
Atomic number
Mass
Melting point
  • 1,822 K
Boiling point
  • 2,223 K
Density
  • 9,289.11 kg/m³
Discovered by
Discovered
  • 1879

Overview

All data

107 statements · 25% with external sources · numbers in brackets are citations

Named after
Canonical SMILES
Formula
Electronegativity
  • 1
Unicode character
Part of
Ionic radius
  • 1.01 ångström charge number: 2 · coordination number: 6
  • 1.09 ångström charge number: 2 · coordination number: 7
  • 0.88 ångström charge number: 3 · coordination number: 6
  • 0.99 ångström charge number: 3 · coordination number: 8
Space group
Crystal system
Bulk modulus
  • 45.5B Pa
Shear modulus
  • 31.3B Pa
Poisson's ratio
  • 0.22
Thermal conductivity
  • 16.8 watt per metre kelvin
Electrical conductivity
  • 1,477,000 siemens per metre
Subclass of
Point group
Has characteristic
Ionization energy
Electron configuration
IPA transcription
Oxidation state
  • 3
  • 0
  • 1
  • 2
Atomic radius
  • 175 picometre
Covalent radius
  • 190 picometre

On other databases

53 identifiers linking thulium across the web's reference databases