Ellerdale - Hydrogen

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general information about Hydrogen

Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75 % of the Universe's elemental mass. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Naturally occurring elemental hydrogen is relatively rare on Earth.

Aliases: 0099-b747

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