Any element of the periodic
table which is in group 2.
In order of proton number, Beryllium, Magnesium, Calcium, Strontium, Barium and Radium are all Alkaline
Earth Metals.
They are characterized by all having 2 outer-shell electrons (two electrons in their valence shell), alas their placing in group 2 of the periodic
table.
They are all silver coloured,
soft metals which react readily to form ionic compounds.
The name 'Alkaline
Earth Metals' is derived from the fact that the oxides formed by the elements in this group produce basic Alkaline solutions, and the melting points are such that the elements remain solid (Earths) in fires. Alkaline
Earth refers to the oxides themselves.
x + 2H2O --> x(OH)2 + H2
2x + O2 --> 2xO
2xO + 2H2O --> 2x(OH)2
Where x is an Alkaline
Earth Metal.
Both processes are relatively efficient unless you consider Hydrogen, which is produced in the first, to be a waste product. The second process only produces the hydroxide.
Magnesium is an Alkaline
Earth Metal - it, and its oxide, react with
water to form a basic alkaline solution.
Mg + 2H2O --> Mg(OH)2 + H2
Magnesium +
Water --> Magnesium Hydroxide + Hydrogen
2Mg + O2 --> 2MgO
Magnesium + Oxygen --> Magnesium Oxide
2MgO + 2H2O --> 2Mg(OH)2
Magnesium Oxide + Water --> Magnesium Hydroxide
The electron configuration of Magnesium is 2,8,2 - two electrons in its outer/valence shell
