Template:Infobox barium

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Barium,  56Ba
Barium unter Argon Schutzgas Atmosphäre.jpg
General properties
Appearancesillery gray; wi a fauch yellae tint[1]
Staundart atomic wecht (Ar, staundart)137.327(7)[2]
Barium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Sr

Ba

Ra
caesiumbariumlanthanum
Atomic nummer (Z)56
Groupgroup 2 (alkaline yird metals)
Periodperiod 6
Element category  alkalineearthmetals
Blocks-block
Electron confeeguration[Xe] 6s2
Electrons per shell
2, 8, 18, 18, 8, 2
Pheesical properties
Phase (at STP)solit
Meltin pynt1000 K ​(727 °C, ​1341 °F)
Bylin pynt2118 K ​(1845 °C, ​3353 °F)
Density (near r.t.)3.51 g/cm3
when liquid (at m.p.)3.338 g/cm3
Heat o fusion7.12 kJ/mol
Heat o vapourisation142 kJ/mol
Molar heat capacity28.07 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 911 1038 1185 1388 1686 2170
Atomic properties
Oxidation states+2, +1 ​(a strangly basic oxide)
ElectronegativityPauling scale: 0.89
Ionisation energies
  • 1st: 502.9 kJ/mol
  • 2nd: 965.2 kJ/mol
  • 3rd: 3600 kJ/mol
Atomic radiusempirical: 222 pm
Covalent radius215±11 pm
Van der Waals radius268 pm
Coloyr lines in a spectral range
Spectral lines o Infobox barium
Miscellanea
Creestal structurbody-centred cubic (bcc)
Body-centered cubic creestal structur for barium
Speed o soond thin rod1620 m/s (at 20 °C)
Thermal expansion20.6 µm/(m·K) (at 25 °C)
Thermal conductivity18.4 W/(m·K)
Electrical resistivity332 nΩ·m (at 20 °C)
Magnetic orderinparamagnetic[3]
Young's modulus13 GPa
Shear modulus4.9 GPa
Bouk modulus9.6 GPa
Mohs haurdness1.25
CAS Nummer7440-39-3
History
DiskiveryCarl Wilhelm Scheele (1772)
First isolationHumphry Davy (1808)
Main isotopes o barium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
130Ba 0.106% (0.5–2.7)×1021 y εε 130Xe
132Ba 0.101% >3×1020 y (β+β+) 132Xe
133Ba syn 10.51 y ε 133Cs
134Ba 2.417% (SF)
135Ba 6.592% (SF)
136Ba 7.854% (SF)
137Ba 11.23% (SF)
138Ba 71.7% (SF)
Decay modes in parentheses is predictit, but hisnae yet been observed
| references | in Wikidata

References

Thir references will appear in the airticle, but this list appears anerly on this page.
  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. p. 112. ISBN 0080379419. 
  2. Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  3. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 
  4. Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights
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