Sodium
From Tardis Wiki, the free Doctor Who reference
Sodium was an element. It was a vital nutrient and was necessary for living things to grow. (TV: The Waters of Mars)
Sodium chloride was the chemical name for salt. (TV: The Sensorites, Image of the Fendahl, Four to Doomsday et al.) Rex Matheson once had low sodium levels in his blood and needed some salt. (TV: Rendition)
Captain Maitland's spectrograph of minerals in the vicinity of the Sense Sphere showed emission wavelengths of "ordinary" oxygen, hydrogen, and sodium, as well as the rare molybdenum. (TV: The Sensorites)
Sodium ethoxide (C₂H₅ONa) was the derivative of sodium acting on ethyl alcohol. (TV: The Power of the Daleks)
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