Magnesium is a water-soluble element. The amount of a material that is dissolvable in a given amount of solvent determines solubility. One example of solubility is adding alcohol to water, while insolubility is demonstrated by adding oil to water.
Magnesium is a metal listed on the periodic chart. It is found in the earth's crust, as well as in combination with other minerals in nature, such as dolomite and magnesite. Magnesium also exists in the human body and in seawater. Due to its ability to burn brightly as a source of light, this element is used in flare guns, incendiary bombs and pyrotechnics.