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rubidium
Image: Wikimedia Commons

rubidium

Chemical element with symbol Rb and atomic number 37

Chemical elementchemical elementlithophile elementQ895

Also known as Rb · element 37 · 37Rb

Symbol
Atomic number
Mass
Melting point
  • 312.46 K
Boiling point
  • 960 K
Density
  • 1,532 kg/m³
Discovered by
Discovered
  • 1861

Overview

All data

137 statements · 23% with external sources · numbers in brackets are citations

Subclass of
Canonical SMILES
Formula
Electronegativity
  • 1
Location of discovery
Standard molar entropy
Part of
Unicode character
Named after
  • red language: Latin · subject named as: rubidus
Ionic radius
  • 1.52 ångström charge number: 1 · coordination number: 6
  • 1.61 ångström charge number: 1 · coordination number: 8
  • 1.66 ångström charge number: 1 · coordination number: 10
  • 1.72 ångström charge number: 1 · coordination number: 12
Electron configuration
  • [Kr] 5s¹
Oxidation state
  • 1
  • -1
Made from material
Space group
Crystal system
Thermal conductivity
  • 58 watt per metre kelvin
Electrical conductivity
  • 7,520,000 siemens per metre
Speed of sound
  • 1,300 m/s
Electrical resistivity
  • 1.28e-7 ohm metre
Point group
Standard enthalpy of formation
  • 80.9 kilojoule per mole state of matter: gas
  • 2.18 kilojoule per mole state of matter: liquid
Has characteristic
Linear thermal expansion coefficient
  • 85.6 micrometre per metre kelvin temperature: 20°C
Ionization energy
IPA transcription
Atomic radius
  • 235 picometre
Covalent radius
  • 220 picometre

On other databases

75 identifiers linking rubidium across the web's reference databases