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barium
Image: Wikimedia Commons

barium

Chemical element with symbol Ba and atomic number 56

Chemical elementchemical elementlithophile elementQ1112

Also known as Ba · element 56 · 56Ba

Symbol
Atomic number
Mass
Melting point
  • 727°C
Boiling point
  • 1,897°C
Density
  • 3.338 g/cm³
Discovered by
Discovered

Overview

All data

152 statements · 22% with external sources · numbers in brackets are citations

Oxidation state
  • 2
  • 1
Location of discovery
Formula
Canonical SMILES
Different from
MCN code
  • 2805.19.20
Molar fusion enthalpy
  • 7.12 kilojoule per mole temperature: 727°C
Ionization energy
  • 502.9 kilojoule per mole
  • 965.2 kilojoule per mole
  • 3,600 kilojoule per mole
Unicode character
Electronegativity
  • 0.89
Part of
Named after
Ionic radius
  • 1.35 ångström charge number: 2 · coordination number: 6
  • 1.42 ångström charge number: 2 · coordination number: 8
  • 1.61 ångström charge number: 2 · coordination number: 12
Electron configuration
  • [Xe] 6s²
  • 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²
Subject lexeme
Bulk modulus
  • 8.93B Pa
Shear modulus
  • 5.67B Pa
Poisson's ratio
  • 0.238
Thermal conductivity
  • 18 watt per metre kelvin
Electrical conductivity
  • 2,940,000 siemens per metre
Speed of sound
  • 1,620 m/s
Electrical resistivity
  • 3.32e-7 ohm metre
Subclass of
Standard enthalpy of formation
  • 179.08 kilojoule per mole state of matter: gas
  • 4.99 kilojoule per mole state of matter: liquid
Standard molar entropy
  • 170.25 joule per mole kelvin state of matter: gas
  • 66.33 joule per mole kelvin state of matter: liquid
  • 62.48 joule per mole kelvin state of matter: solid
Mohs' hardness
  • 1.25
Has characteristic
Linear thermal expansion coefficient
  • 20.47 micrometre per metre kelvin temperature: 20°C
IPA transcription
Crystal system
Atomic radius
  • 215 picometre
Covalent radius
  • 215 picometre

On other databases

87 identifiers linking barium across the web's reference databases