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platinum
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platinum

Chemical element with symbol Pt and atomic number 78

Chemical elementchemical elementQ880

Also known as element 78 · Pt · 78Pt

Symbol
Atomic number
  • 78
Mass
Melting point
  • 2,041.4 K
Boiling point
  • 4,100 K
Density
  • 21,134.9 kg/m³
Discovered by
Discovered
  • 1557

Overview

All data

151 statements · 17% with external sources · numbers in brackets are citations

Subclass of
Made from material
Permanent duplicated item
Different from
Unicode character
Electronegativity
  • 2.28
Part of
Named after
Ionic radius
  • 0.6 ångström charge number: 2 · coordination number: 4
  • 0.8 ångström charge number: 2 · coordination number: 6
  • 0.63 ångström charge number: 4 · coordination number: 6
Associated hazard
Space group
Crystal system
Bulk modulus
  • 248B Pa
Shear modulus
  • 49.5B Pa
Poisson's ratio
  • 0.406
Thermal conductivity
  • 72 watt per metre kelvin
Electrical conductivity
  • 9,480,000 siemens per metre
Specific heat capacity
  • 130 joule per kilogram kelvin
Speed of sound
  • 2,680 m/s
Electrical resistivity
  • 1.05e-7 ohm metre
Point group
Mohs' hardness
  • 3.5
Has characteristic
Linear thermal expansion coefficient
  • 8.93 micrometre per metre kelvin temperature: 20°C
Ionization energy
Electron configuration
IPA transcription
Oxidation state
  • 2
  • 4
  • -3
  • -2
  • -1
  • 0
  • 1
  • 3
Show 2 more
  • 5
  • 6
Atomic radius
  • 135 picometre
Covalent radius
  • 136 picometre

On other databases

77 identifiers linking platinum across the web's reference databases