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boron
Image: Wikimedia Commons

boron

Chemical element with symbol B and atomic number 5

Chemical elementchemical elementsimple substancelithophile elementQ618

Also known as ₅B · element 5 · boracium

Symbol
Atomic number
Mass
Melting point
Boiling point
Density
  • 2,080 kg/m³
  • , 2.46 g/cm³
Discovered by
Discovered

Overview

All data

172 statements · 27% with external sources · numbers in brackets are citations

Oxidation state
  • 3
  • 2
  • 1
  • -5
  • -1
  • 0
Named after
Canonical SMILES
Formula
Electronegativity
  • 2
Part of
Subject has role
Ultimate tensile strength
  • 5,700 MPa
Unicode character
Electron configuration
  • 1s² 2s² 2p¹
  • [He] 2s² 2p¹
Different from
Made from material
Space group
Crystal system
Bulk modulus
  • 210B Pa
Shear modulus
  • 172B Pa
Poisson's ratio
  • 0.178
Thermal conductivity
  • 27 watt per metre kelvin
Electrical conductivity
  • 0.0001 siemens per metre
Specific heat capacity
  • 1,260 joule per kilogram kelvin
Speed of sound
  • 16.2 m/s
Point group
Standard enthalpy of formation
  • 560 kilojoule per mole state of matter: gas
  • 48.93 kilojoule per mole state of matter: liquid
Standard molar entropy
  • 153.436 joule per mole kelvin state of matter: gas
  • 26.54 joule per mole kelvin state of matter: liquid
  • 5.9 joule per mole kelvin state of matter: solid
Mohs' hardness
  • 9.3
Has characteristic
Ionization energy
Subclass of
IPA transcription
Atomic radius
  • 85 picometre
Covalent radius
  • 84 picometre

On other databases

80 identifiers linking boron across the web's reference databases