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Hydrogen is the most common element in the universe, represented by the symbol H (Atomic number : Z=1, which means one single proton core plus one single electron gravitating around). Stars are mainly composed of hydrogen in its plasma state.
A hydrogen in-rush was a crucial part of Event One. (DW: Castrovalva)
Hydrogen could also be used as a base in the process to form huon particles. (DW: The Runaway Bride)
