ELEMENT
hydrogen
Symbol (Terran )
H
Atomic number
1
Atomic weight
1
Hydrogen is a chemical element , and is the first element in the periodic table . In simplest form, a hydrogen atom is composed of one proton and one electron , and is classed as the most basic, and most abundant, of the elements in the known universe . Hydrogen has two isotopes, known as deuterium and tritium , with one or two neutrons , respectively, included in the atom. (ST reference : Star Fleet Medical Reference Manual ; TNG episode : "Night Terrors ")
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