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By (user no longer on site) 15 weeks ago
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Hydrogen.
At standard temperature and pressure, it is a colourless, odourless, nonmetallic, tasteless, highly flammable diatomic gas with the molecular formula H2. 75% of all mass in the universe is hydrogen and 90% of all atoms in the universe is hydrogen atoms.
Whilst it’s technically colourless it can come in a variety of colours— blue, green, pink, turquoise, yellow but most hydrogen is “neutral coloured” in grey. The colours are indicative of how the hydrogen is produced.
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