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Sodium was discovered at the Royal Institution in England by Sir Humphry Davy. Davy isolated sodium in 1807 through the electrolysis of sodium hydroxide. He used electrolysis to isolate other elements such as potassium, barium and magnesium.
All of the discovered alkali metals occur in nature: in order of abundance, sodium is the most abundant, followed by potassium, lithium, rubidium, caesium, and finally francium, which is very rare due to its extremely high radioactivity and thus occurs only in traces due to its presence in natural decay chains.ll of the alkali metal halides have the formula MX where M is an alkali metal and X is a halogen. They are all white ionic crystalline solids. All the alkali metal halides are soluble in water except for lithium fluoride (LiF), which is insoluble in water due to its very high lattice enthalpy.