ATOMIC NUMBER HYDROGEN Crossword Clue

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Crossword Puzzle Infos
The atomic number of hydrogen is 1, which means that it has ONE proton in its nucleus. This is the smallest number of protons of any element and is the basis for its designation as the first element in the periodic table. Hydrogen is the most abundant element in the universe, making up about 75% of all matter. It is also the lightest element, with an atomic weight of 1.008.
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