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When magnesium is in its metal form it will burn very easily in air. However, in order to start the reaction (the burning) the magnesium metal needs a source of energy. The flame provides a source of heat so that the magnesium metal atoms can overcome their activation energy.
1 Isolated by Sir Humphry Davy in 1808. 2  For many years magnesium was thought to be the same element as calcium. 3  A magnesium fire is very difficult to put out as it can burn in nitrogen, carbon dioxide, and water.