Hydrogen-1 or 1H is the most common hydrogen isotope with an abundance of more than 99.98%. The nucleus of this isotope consists of only a single proton, therefore it is given the descriptive, but rarely used, formal name protium, or a commonly used name light hydrogen. It contains no neutrons, and is stable. The hydrogen atom has special significance in quantum mechanics and quantum field theory as a simple two-body problem physical system which has yielded many simple analytical solutions in closed-form.
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