Potassium was an element. K9 Mark II concured that it was highly conductive to health. (COMIC: Death to the Doctor!) It was a vital nutrient and was necessary for living things to grow. (TV: The Waters of Mars)
The Ninth Doctor claimed bananas were a good source of potassium. (TV: The Doctor Dances)
Potassium nitrate and sulphur were constituents of gunpowder. (TV: The Visitation)
Thea Ransome performed a potassium-argon test in the dating of "Eustace". (TV: Image of the Fendahl)
Potassium Street a street in Paradise Towers. (TV: Paradise Towers)
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