Home
background
  • Key data; description
  • History
  • hydrogen around us
  • Uses
  • Geology
  • Biology
  • hydrogen compounds
  • Reactions of hydrogen
  • Compounds
  • Bond enthalpies
  • Radii in compounds
  • Lattice energies
  • Reduction potentials
  • nuclear properties
  • NMR
  • Naturally occurring isotopes
  • Radioisotopes
  • electronic properties
  • Electronic configuration
  • Ionization energies
  • Electron affinities
  • Electronegativities
  • Effective nuclear charges
  • Electron binding energies
  • Atom radii
  • Valence shell radii
  • physical properties
  • Bulk properties (density, resistivity, etc.)
  • Thermal properties (melting point, etc.)
  • Thermodynamic properties
  • crystallography
  • Crystal structure
  • Elements

    STRONTIUM
    38
    Sr
    87.62 (1) g r


    Name: strontiumGroup number: 2
    Symbol: SrGroup name: Alkaline earth metal
    Atomic number: 38Period number: 5
    Atomic weight: 87.62 (1) g rBlock: s-block
    CAS Registry ID: 7440-24-6Voice:
    Standard state: solid at 298 KColour: silvery white
    Classification: MetallicAvailability:

    strontium
    This sample is from The Elements Collection, an attractive and safely packaged collection of the 92 naturally occurring elements that is available for sale.

    Strontium does not occur as the free element. Strontium is softer than calcium and decomposes water more vigorously. Freshly cut strontium has a silvery appearance, but rapidly turns a yellowish colour with the formation of the oxide. The finely divided metal ignites spontaneously in air. Volatile strontium salts impart an excellent crimson colour to flames, and these salts are used in pyrotechnics.

    WebElements movies

    play QuickTime movie
    [QuickTime, 1.5mb download]

    play MPEG movie
    [MPEG, 3.2mb download]

    To play the movies, you need QuickTime for MacOS or Windows installed, or some other MPEG movie viewer.
    various metal salts colour flames
    The picture above shows the result of adding different metal salts to a burning reaction mixture of potassium chlorate and sucrose. The red colour originates from strontium sulphate. The orange/yellow colour originates from sodium chloride. The green colour originates from barium chlorate. The blue colour originates from copper (I) chloride. The lilac colour that should be evident from the potassium chlorate is washed out by the other colours, all of which are more intense. Do not attempt this reaction unless are a professionally qualified chemist and you have carried out a legally satisfactory hazard assessment. Improperly done, this reaction is dangerous! Select a movie icon to see flame burning in from right to left.

    The picture shows the colour arising from adding strontium sulphate salt to a burning mixture of potassium chlorate and sucrose.

    The picture above shows the colour arising from adding strontium sulphate salt (SrSO4) to a burning mixture of potassium chlorate and sucrose. Do not attempt this reaction unless are a professionally qualified chemist and you have carried out a legally satisfactory hazard assessment.

    Strontium-90 (90Sr) has a half-life of 28 years. It is a product of nuclear fallout and presents a major health problem. Strontium titanate is an interesting optical material as it has an extremely high refractive index and an optical dispersion greater than that of diamond. It has been used as a gemstone, but it is very soft.

    Isolation

    Here is a brief summary of the isolation of strontium.

    Strontium metal is available commercially and there is no need to make it in the laboratory. Commercially it is made on small scale by the electrolysis of molten strontium chloride, SrCl2.

    cathode: Sr2+(l) + 2e- Sranode: Cl-(l) 1/2Cl2 (g) + e-

    Strontium metal can also be islated from the reduction of strontium oxide, SrO, with aluminium.

    6SrO + 2Al 3Sr + Sr3Al2O6

    Fluorides
  • SrF2
  • Chlorides
  • SrCl2
  • Bromides
  • SrBr2.6H2O
  • SrBr2
  • Iodides
  • SrI2
  • Hydrides
  • SrH2
  • Oxides
  • SrO
  • SrO2
  • Sulfides
  • SrS
  • Selenides
  • SrSe
  • Tellurides
    none listed
    Nitrides
    none listed






    Our data and resources are taken from Web Elements