Formula: MgO Hill system formula: Mg1O1 CAS it is registered number: <1309-48-4> Formula weight: 40.304 Class: oxide Colour: white Appearance: crystalline heavy Melting point: 2830°C Boiling point: 3600°C Density: 3600 kg m-3

The oxidation variety of magnesium in magnesium oxide is 2.

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Magnesium oxide is obtainable from the thermal deterioration of magnesium hydroxide or magnesium carbonate.

Mg(OH)2 (heat) → MgO(s) + H2O(l)

MgCO3 (heat) → MgO(s) + CO2(g)

Solid state structure

Geometry of magnesium: 6 coordinate: octahedralPrototypical structure: NaCl (rock salt)


Element analysis

The table shows element percentages for MgO (magnesium oxide).

aspect %
Mg 60.30
O 39.70

Isotope pattern for MgO

The chart below shows the calculated isotope pattern for the formula MgO v the many intense ion collection to 100%.


The data on these compounds pages room assembled and adjusted from the main literature and several other sources consisting of the following.

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R.T. Sanderson in Chemical Periodicity, Reinhold, new York, USA, 1960.A.F. Trotman-Dickenson, (ed.) in Comprehensive not natural Chemistry, Pergamon, Oxford, UK, 1973.R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, man Wiley & Sons, 1963.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.J.W. Mellor in A comprehensive treatise on inorganic and also theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.J.E. Macintyre (ed.) in Dictionary of not natural compounds, quantities 1-3, Chapman & Hall, London, UK, 1992.

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