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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 Schrodinger Equation. Hydrogen atoms are the only atoms which could exist even n a world with fine - structure constant 1.

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I agree with @john rennie, but I think it's worth noting that reaction rates for D-T are higher at a lower temperature as compared to D-D: Higher temperatures present many difficult engineering cha …
answered Nov 3 '16 by Charles