Barium

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Barium,  56Ba
Barium unter Argon Schutzgas Atmosphäre.jpg
General properties
Appearance sillery gray; wi a fauch yellae tint[1]
Staundart atomic wecht (Ar, staundart) 137.327(7)
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
Group group 2 (alkaline yird metals)
Period period 6
Element category   alkalineearthmetals
Block s-block
Electron confeeguration [Xe] 6s2
Electrons per shell
2, 8, 18, 18, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1000 K ​(727 °C, ​1341 °F)
Bylin pynt 2118 K ​(1845 °C, ​3353 °F)
Density (near r.t.) 3.51 g/cm3
when liquid (at m.p.) 3.338 g/cm3
Heat o fusion 7.12 kJ/mol
Heat o vapourisation 142 kJ/mol
Molar heat capacity 28.07 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)
Electronegativity Pauling scale: 0.89
Ionisation energies
  • 1st: 502.9 kJ/mol
  • 2nd: 965.2 kJ/mol
  • 3rd: 3600 kJ/mol
Atomic radius empirical: 222 pm
Covalent radius 215±11 pm
Van der Waals radius 268 pm
Color lines in a spectral range
Miscellanea
Creestal structurbody-centred cubic (bcc)
Body-centered cubic creestal structur for barium
Speed o soond thin rod 1620 m/s (at 20 °C)
Thermal expansion 20.6 µm/(m·K) (at 25 °C)
Thermal conductivity 18.4 W/(m·K)
Electrical resistivity 332 nΩ·m (at 20 °C)
Magnetic orderin paramagnetic[2]
Young's modulus 13 GPa
Shear modulus 4.9 GPa
Bouk modulus 9.6 GPa
Mohs haurdness 1.25
CAS Nummer 7440-39-3
History
Diskivery Carl Wilhelm Scheele (1772)
First isolation Humphry 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

Barium is a chemical element wi seembol Ba an atomic nummer 56.

References[eedit | eedit soorce]

  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. p. 112. ISBN 0080379419. 
  2. 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. 
  3. Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights