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radium
Image: Wikimedia Commons

radium

Chemical element with symbol Ra and atomic number 88

Chemical elementchemical elementQ1128

Also known as 88Ra · element 88 · Ra

Symbol
Atomic number
  • 88
Mass
Melting point
  • 973 K
Boiling point
  • 2,010 K
Density
  • 5,500 kg/m³
Discovered by
Discovered

Overview

All data

125 statements · 28% with external sources · numbers in brackets are citations

Named after
Canonical SMILES
Formula
Unicode character
Electronegativity
  • 0.9
Part of
Different from
Ionic radius
  • 1.48 ångström charge number: 2 · coordination number: 8
  • 1.7 ångström charge number: 2 · coordination number: 12
Electron configuration
  • [Rn] 7s²
Oxidation state
  • 2
Space group
Crystal system
Thermal conductivity
  • 19 watt per metre kelvin
Electrical conductivity
  • 1,000,000 siemens per metre
Electrical resistivity
  • 1e-6 ohm metre
Subclass of
Point group
Ionization energy
IPA transcription
Atomic radius
  • 215 picometre
Covalent radius
  • 221 picometre

On other databases

74 identifiers linking radium across the web's reference databases