|Density (at 0oC)||1.74 g/cm3|
|Boiling point||1363 K|
|Melting point||923 K|
Magnesium is an alkaline Earth metal and it is naturally found in rocks and minerals.
Magnesium is an important element for humans, animals, and plants. Humans and animals need it for many of their enzymes to function properly and to maintain healthy bones. Plants contain magnesium as the central molecule in chlorophyll, the compound that makes plants green.
Magnesium is used as an alloying agent with other metals. It is strong and lightweight, so it improves the mechanical characteristics of alloys without drastically increasing the weight. It is not used on its own or in large amounts in compounds because it has a tendency to corrode and combust. Magnesium alloys are used in aircrafts, automotives, and many electronic goods, such as cell phones and computers.
Ignited pure magnesium burns very brightly and easily, so it is used in fireworks and flares (Figure 2). In contrast to this, magnesium oxides and hydroxides are used to to increase the heat and fire resistance of plastics and building materials.