warrant. 1  authorization, sanction, or justification. 2  something that serves to give reliable or formal assurance of something; guarantee, pledge, or security. 3  something considered as having the force of a guarantee or as being positive assurance of a thing: The cavalry and artillery were considered sure warrants of success.
Potassium metal was discovered in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH), by the use of electrolysis of the molten salt with the newly discovered voltaic pile. Before the 18th century, no distinction was made between potassium and sodium.
Sodium was discovered by Sir Humphrey Davy in England in 1807. He  discovered that he could separate out the sodium from compounds by  using electricity.otassium was discovered by Sir Humphrey Davy in 1807 Lithium was discovered by Johan August Arfvedson in 1817 Sodium was discovered by Sir Humphrey Davy in 1807. 6 people found this useful.