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Hydrogen, most abundant in the universe, is the chemical element with atomic number 1, and an atomic mass of 1.00794 amu, the lightest of all known elements. It exists as a diatomic gas (H2). Hydrogen is the most abundant gas in the universe.
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Hydrogen is the lightest element in solar undiverse with atomic number 1 and atomic mass of 1.00794(approx)amu.and this is the most abundant gas. Hope this helps.pls mark as brainliest...
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