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Thorium was, according to the First Doctor, a "highly fissionable element". With some adjustments, it could be used instead of uranium for the proper functioning of the Doctor's TARDIS. The planet Fragrance was rich in this element. (AUDIO: The Fragile Yellow Arc of Fragrance)

v • e Elements

Periodic table	Hydrogen¹ • Helium² • Lithium³ • Beryllium⁴ • Boron⁵ • Carbon⁶ • Nitrogen⁷ • Oxygen⁸ • Fluorine⁹ • Neon¹⁰ • Sodium¹¹ • Magnesium¹² • Aluminium¹³ • Silicon¹⁴ • Phosphorus¹⁵ • Sulphur¹⁶ • Argon¹⁸ • Potassium¹⁹ • Calcium²⁰ • Titanium²² • Vanadium²³ • Chromium²⁴ • Manganese²⁵ • Iron²⁶ • Nickel²⁸ • Copper²⁹ • Zinc³⁰ • Gallium³¹ • Arsenic³³ • Zirconium⁴⁰ • Molybdenum⁴² • Palladium⁴⁶ • Silver⁴⁷ • Cadmium⁴⁸ • Tin⁵⁰ • Antimony⁵¹ • Tellurium⁵² • Caesium⁵⁵ • Terbium⁶⁵ • Erbium⁶⁸ • Tantalum⁷³ • Tungsten⁷⁴ • Iridium⁷⁷ • Platinum⁷⁸ • Gold⁷⁹ • Mercury⁸⁰ • Lead⁸² • Bismuth⁸³ • Thorium⁹⁰ • Uranium⁹² • Neptunium⁹³ • Plutonium⁹⁴ • Californium⁹⁸ • (Ek¹⁰⁴) • Dubnium¹⁰⁵

Universal periodic table	Chaos matter

Greek elements	Water • Earth • Fire • Air

Chinese elements	Water • Earth • Fire • Wood • Metal

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