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Hydrogen

Atomic Number: 1
Abbreviation: H


Hydrogen (chemical symbol H and atomic number 1) is a chemical element. It is thought to be the most
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abundant element in the universe. It is also the lightest element on the periodic table.

Hydrogen is a gas at room temperature. Its melting and boiling points are very low (approximately 14 K and 20 K above absolute zero, respectively).

Water (H2O) is a well-known chemical compound, which consists of two hydrogen atoms and one oxygen atom.





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