Potassium as a
chemical element was discovered
only in the XIX century:
the English physicist and chemist
Humphry Davy extracted it from potassium
hydroxide (KOH) by electrolysis in 1807 and
named it potassium. In 1809 his German
counterpart Ludwig Wilhelm Gilbert suggested
the name “kalium” (from the Arabic word
“al-kali” – potassium carbonate). The original name
of the element is preserved in
the UK, USA, France and
some other countries, while Russia, Germany,
Austria and the Scandinavian
countries adopted
Gilbert’s name.