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It could refer to (1) A hydrogen molecule; two hydrogen atoms bonded together, or (2) A hydrogen atom; one electron electromagnetically interacting with a nucleus made of a single proton. Hydrogen atoms are the simplest atoms, and they are the only atoms for which we can exactly solve the Schrödinger Equation. Hydrogen atoms are the only atoms which could exist even in a world with fine-structure constant $1$.

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Fusion: Why deuterium and tritium?

I would like to know why scientists try to use deuterium and tritium for fusion and not just the ordinary isotope of Hydrogen ${}^1H$? …
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