Flammable, colourless gas; the most abundant element in the universe
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Related clues
- Lightest of all the elements
- Lightest of all elements
- Weighing virtually nothing, yet building almost every star and three quarters of all ordinary matter, the universe's first element and its primordial cosmic gas
- A colourless, odourless gas whose name derives from the Greek for 'water forming'
- Gaseous element with the atomic number 1
Possible answers
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- N