- A silvery-white metallic chemical element with atomic number 12. It has about 15 known isotopes, of which 3 are stable. Magnesium is chemically active, hard, and when finely divided easily ignitable upon heating in air, producing a striking white flash which can be used in flash bulbs or pyrotechnics. Other applications include its use in light alloys, batteries, optical mirrors, and precision instruments. Its chemical symbol is Mg.
- chemical symbol Mg
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