what is hydrogen ??
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Hydrogen is the simplest elements. An atoms of hydrogen consists of only one proton and one electron. Hydrogen is the first element in the periodic table .
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Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass
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