Magnesium compounds: magnesium dihydride

magnesium symbol icon

The magnesium in magnesium dihydride formally is in the oxidation state 2.

Crystal structure of magnesium dihydride

Magnesium dihydride

  • Formula as often written: MgH2
  • Hill system formula: H2Mg1
  • CAS registry number: [7693-27-8]
  • Formula weight: 26.321
  • Class: hydride

Synonyms

  • magnesium dihydride
  • magnesium(II) hydride
  • magnesium hydride

Physical properties

  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 327°C (dehydrogenates to Mg + H2)
  • Boiling point:
  • Density: 1450 kg m-3

Suppliers

Coming soon...

Element analysis

Element percentages for the elements in magnesium dihydride
Element %
H 7.66
Mg 92.34

Synthesis

Magnesium hydride is available from the direct interaction of magnesium metal and hydrogen gas.

Mg(s) + H2(g) → MgH2(s)

Solid state structure

  • Geometry of magnesium:
  • Prototypical structure:

Crystal structure of magnesium dihydride

Isotope pattern

What follows is the calculated isotope pattern for the MgH2 unit with the most intense ion set to 100%.

Formula: Mg1H2

mass  %
26 100.0 __________________________________________________
27 12.7 ______
28 13.9 _______
29 0.0

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.

WebElements Shop

WebElements now has a WebElements shop at which you can buy periodic table posters, mugs, T-shirts, games, fridge magnets, molecular models, and more.

Periodic Table fridge magnets Periodic Table fridge magnets
Buy our periodic table fridge magnets here

WebElements poster Periodic table t-shirts Periodic table mouse mats Molymod molecular model kits Chemistry educational resources

magnesium atomic number