Magnesium is one of the ten most widely distributed elements in nature (magnesium is the eighth rich element in the earth's crust, about 2% of the mass, and the more than 9 element in the universe). But because it is not easily reduced from the compound to a single state, it has not been found late.
For a long time, chemists would regard magnesia oxide magnesia obtained from magnesia bearing magnesia as an indispensable substance. It was listed in the list of elements published by Lavoisier in 1789. In 1808, after successfully making calcium, David succeeded in producing magnesium metal by the same method. Since then, magnesium has been identified as an element and named magnesium, and the element symbol is Mg.