Mercury (element)
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Mercury was a corrosive chemical element found on many planets, including Earth, Go-Ray and Skaro. Mercury could easily be found in any scientific community, particularly in labs. (TV: The Daleks)

Exposure to mercury had a negative effect on many species, as well as robots. A canister of mercury was used to corrode and disable a Gold Assassin who was on board a Roman sailing vessel. (COMIC: Golden Slumbers)

Mercury poisoning was a common complaint among sailors. Amy Ivans, a passenger of the Lankester, was being poisoned with small doses of mercury, administered by Jacques de Requin. (AUDIO: Cryptobiosis)

Many devices required mercury to function. For example, on Go-Ray, the First Doctor, John and Gillian acquired mercury to repair a cardium reactor. (COMIC: Enter: The Go-Ray) The First Doctor falsely claimed that his TARDIS' fluid link had run out of mercury as a ruse to explore the Dalek City. (TV: The Daleks)

The Second Doctor visited the Panjistri homeworld to stock up on mercury. (PROSE: Timewyrm: Apocalypse) Later, the mercury in the fluid links evaporated, forcing the Doctor and Jamie McCrimmon to evacuate the TARDIS. The Doctor acquired more mercury on Space Station W3. (TV: The Wheel in Space)

The Fourth Doctor acquired some needed mercury in 1931 Chicago, unknowingly defeating the Master's plans by doing so. (PROSE: The Duke of Dominoes)

The Seventh Doctor stole some from mercury the Wierdarbi with the aid of Catherine Broome to refill the fluid links. (PROSE: Companion Piece)

The Eighth Doctor visited a podule orbiting Jupiter in search of mercury for his TARDIS' fluid links. (PROSE: To the Slaughter)

The planet Vulcan had mercury swamps on its surface. (TV: The Power of the Daleks) Skaro had geysers of mercury. The Dalek Emperor attempted to kill Zeg near one of them. (COMIC: Duel of the Daleks) The Acteon Galaxy had asteroids made of mercury. (AUDIO: Neverland)

The Eighth Doctor visited Rontan 9 during the Last Great Time War in search of mercury to repair his TARDIS' fluid links. (PROSE: Natural Regression)