Frae Wikipedia
Lowp tae: navigation, rake
Barium,  56Ba
Barium unter Argon Schutzgas Atmosphäre.jpg
General properties
Name, seembol barium, Ba
Appearance sillery gray; wi a fauch yellae tint[1]
Pronunciation /ˈbɛriəm/
Barium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer (Z) 56
Group, block group 2 (alkaline yird metals), s-block
Period period 6
Element category   alkaline yird metals
Staundart atomic wicht (±) (Ar) 137.327(7)[2]
Electron configuration [Xe] 6s2
per shell
2, 8, 18, 18, 8, 2
Pheesical properties
Phase solid
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
2nt: 965.2 kJ/mol
3rd: 3600 kJ/mol
Atomic radius empirical: 222 pm
Covalent radius 215±11 pm
Van der Waals radius 268 pm
Creestal structur body-centred cubic (bcc)
Body-centered cubic crystal 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[3]
Young's modulus 13 GPa
Shear modulus 4.9 GPa
Bouk modulus 9.6 GPa
Mohs haurdness 1.25
CAS Nummer 7440-39-3
Diskivery Carl Wilhelm Scheele (1772)
First isolation Humphry Davy (1808)
Maist stable isotopes o barium
iso NA hauf-life DM DE (MeV) DP
130Ba 0.106% (0.5–2.7)×1021 y εε 2.620 130Xe
132Ba 0.101% >3×1020 y (β+β+) 0.846 132Xe
133Ba syn 10.51 y ε 0.517 133Cs
134Ba 2.417% (SF) <40.520
135Ba 6.592% (SF) <39.357
136Ba 7.854% (SF) <38.041
137Ba 11.23% (SF) <35.722
138Ba 71.7% (SF) <34.302
Decay modes in parentheses is predictit, but hisnae yet been observed
· references

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. Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights
  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.