HYDROGEN - NCERT
periodic table (Unit 3). 9.2 DIHYDROGEN, H 2 9.2.1 Occurrence Dihydrogen is the most abundant element in the universe (70% of the total mass of the universe) and is the principal element in the Property Hydrogen Deuterium Tritium Relative abundance (%) 99.985 0.0156 10–15 Relative atomic mass (g mol–1) 1.008 2.014 3.016
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