What is the meaning of Hydrogen?
The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
An atom of this element.
Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature.
A molecule of this molecular species.
The isotope hydrogen-1 (protium) (symbol H or H), contrasting with deuterium and tritium.
A sample of the element or molecule.
hydrogen (chemical element, symbol H)
hydrogen (chemical element, symbol H)
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