What is hydrogen?????????
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Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element in the periodic table. ... Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter
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Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element in the periodic table. ... Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter.
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