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.