Magnesium is a somewhat reactive metal in the alkaline earth family. It forms forms a 2+ ion. It reacts with non-metals such as hydrogen, nitrogen and halogens to form ionic compounds. It also reacts with acids and water. Here are some examples of reactions of magnesium:
Magnesium burns brightly in the presence of oxygen to produce MgO:
`2Mg + O_2 -> 2MgO`
This reaction produces the bright sparks seen in fireworks.
Magnesium reacts with hydrochloric acid to produce hydrogen gas:
`Mg + 2HCl -> H_2_(g) + MgCl_2_(aq)`
Magnesium reacts with water to produce magnesium hydroxide and hydrogen:
`Mg +2H_2O -> Mg(OH)_2 + H_2`
Magnesium reacts with halogens such as chlorine to produce salts:
`Mg + Cl_2 -> MgCl_2`
Magnesium is also used in alloys with other metals to provide lightweight strength and corrosion resistance.
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