As it is one third lighter than aluminium, its alloys are useful in aeroplane and missile construction. It improves the mechanical, fabrication and welding characteristics of aluminium when used as an alloying agent. Grignard reagents, which are organic magnesium compounds, are important commercially. Biological Role Magnesium is an essential element in both plant and animal life. It is non-toxic.
Chlorophyls are magnesium-centred porphyrins.
General Information Great care should be taken in handling magnesium metal, especially in the finely-divided state, as serious fires can occur. Water should not be used on burning magnesium or magnesium fires.