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The Element Potassium - Basic Physical and Historical Information ...

Discovered : 1807 by Sir Humphry Davy in London. Origin : The name is derived from the English potash (from which it was first isolated), and the chemical symbol comes from the Latin kalium, potash. Description : A soft, silvery metal that tarnishes within minutes. In water, it reacts rapidly to release hydrogen, which burns with a lilac flame. There are deposits of billions of tonnes of ...