Hydrogen was an element on the periodic table with the symbol H (PROSE: Christmas on a Rational Planet [+]Lawrence Miles, Virgin New Adventures (Virgin Books, 1996).) and atomic number 1. (TV: Shada [+]Douglas Adams, Doctor Who (1992).) It was the most abundant element in the universe. A hydrogen in-rush was a crucial part of Event One. (TV: Castrovalva [+]Christopher H. Bidmead, Doctor Who season 19 (BBC1, 1982).)
The Earth's Sun was made up of 74% hydrogen and 24% helium. (AUDIO: Feast of Fear [+]Martyn Waites, Main Range (Big Finish Productions, 2019).)
Hydrogen and oxygen made up H₂O (PROSE: Christmas on a Rational Planet [+]Lawrence Miles, Virgin New Adventures (Virgin Books, 1996).) or water. (TV: Arc of Infinity [+]Johnny Byrne, Doctor Who season 20 (BBC1, 1983).)
The Fourth Doctor suggested energising hydrogen as an alternative power source to the "mineral slime" oil. (TV: Terror of the Zygons [+]Robert Banks Stewart, Doctor Who season 13 (BBC1, 1975).)
Hydrogen could be used as a base in the process to form huon particles. (TV: The Runaway Bride [+]Russell T Davies, Doctor Who Christmas Special 2006 (BBC One, 2006).)
The R101 was filled with hydrogen gas. (AUDIO: Storm Warning [+]Alan Barnes, Main Range (Big Finish Productions, 2001).)
The Skelloids' life cycle relied on the absorption of hydrogen through their gill-plates. Banto Zame, posing as the Doctor, seemingly foiled an invasion of the Generios system by the Skelloids by exploiting this by using his psychic screwdriver to invert the core of their hydrogen stabilisers. In reality, the Skelloid invasion was nothing but a mere holographic illusion created by him. (AUDIO: The One Doctor [+]Gareth Roberts and Clayton Hickman, Main Range (Big Finish Productions, 2001).)
Among other chemicals, the Source contained hydrogen, which helped allow it to act as a terraforming agent. (TV: The Doctor's Daughter [+]Stephen Greenhorn, Doctor Who series 4 (BBC One, 2008).)
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