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copper
Image: Wikimedia Commons

copper

Chemical element with symbol Cu and atomic number 29

Chemical elementchemical elementsimple substancechalcophile elementQ753

Also known as 29Cu · CU-7 · Tatum-T · element 29 · Paragard T 380A · Cu

Symbol
Atomic number
Mass
Melting point
  • 1,981°F
  • , 1,085°C
Boiling point
Density
  • 8.94 g/cm³
Discovered
  • 7th millennium BCE

Overview

All data

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

Electronegativity
  • 1.9
Oxidation state
  • 1
  • 2
  • 3
  • 4
  • -2
  • 0
Named after
Subclass of
NIOSH Pocket Guide ID
  • 0150
Has effect
Immediately dangerous to life or health
  • 100 milligram per cubic metre
Vapor pressure
  • 0 millimetre of mercury temperature: 68°F
Time-weighted average exposure limit
  • 1 milligram per cubic metre applies to jurisdiction: United States · runtime: 10 h
Canonical SMILES
Permanent duplicated item
Thermal conductivity
  • 401 watt per metre kelvin temperature: 0°C · state of matter: solid
  • 386 watt per metre kelvin temperature: 25°C · state of matter: solid
  • 384.1 watt per metre kelvin temperature: 18.05°C · state of matter: solid
  • 395 watt per metre kelvin temperature: 20°C · state of matter: solid
  • 413 watt per metre kelvin temperature: -73°C · state of matter: solid
  • 401 watt per metre kelvin temperature: 300 K · state of matter: solid
Subject has role
Compressive modulus of elasticity
  • 100 gigapascal
OpenStreetMap tag
  • resource=copper
Formula
Unicode character
Has use
Color
Different from
Part of
Found in taxon
Electrical resistivity
  • 1.7e-8 ohm metre temperature: 20°C
Ionic radius
  • 0.46 ångström charge number: 1 · coordination number: 2
  • 0.6 ångström charge number: 1 · coordination number: 4
  • 0.77 ångström charge number: 1 · coordination number: 6
  • 0.57 ångström charge number: 2 · coordination number: 4
  • 0.73 ångström charge number: 2 · coordination number: 6
Associated hazard
Made from material
2022 Harmonized System Code
Space group
Crystal system
Bulk modulus
  • 151B Pa
Shear modulus
  • 49.8B Pa
Poisson's ratio
  • 0.352
Electrical conductivity
  • 58.1M siemens per metre
Specific heat capacity
  • 385 joule per kilogram kelvin
Speed of sound
  • 3,570 m/s
Point group
Standard enthalpy of formation
  • 337.4 kilojoule per mole state of matter: gas
  • 11.86 kilojoule per mole state of matter: liquid
Standard molar entropy
  • 166.398 joule per mole kelvin state of matter: gas
  • 41.62 joule per mole kelvin state of matter: liquid
  • 33.15 joule per mole kelvin state of matter: solid
Mohs' hardness
  • 3
Has characteristic
Show 5 more properties
Linear thermal expansion coefficient
  • 16.64 micrometre per metre kelvin temperature: 20°C
Ionization energy
Electron configuration
Atomic radius
  • 135 picometre
Covalent radius
  • 132 picometre

On other databases

123 identifiers linking copper across the web's reference databases