proton

https://doi.org/10.1351/goldbook.P04906
@N04237@ of @C00993@ +1, spin quantum number \(\frac{1}{2}\) and rest mass of \(1.007\ 276\ 470(12)\ \text{u}\).
See also:
protium
Source:
Green Book, 2nd ed., p. 93 [Terms] [Book]