The lightest of the chemical elements, atomic number 1
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Related clues
- Gas which combines with oxygen to make water
- 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
- Gas that is the lightest chemical element
- Flammable, colourless gas; the most abundant element in the universe
- Common gas used to remove sulfur from fuels for refinement
Possible answers
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- R
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- N