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2. Proton - Wikipedia

   en.wikipedia.org/wiki/Proton

   A proton is a stable subatomic particle, symbol. p. , H +, or 1 H + with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one atomic mass ...

3. Atomic mass - Wikipedia

   en.wikipedia.org/wiki/Atomic_mass

   Atomic mass - Wikipedia ... Atomic mass

4. Proton-to-electron mass ratio - Wikipedia

   en.wikipedia.org/wiki/Proton-to-electron_mass_ratio

   Proton-to-electron mass ratio. In physics, the proton-to-electron mass ratio (symbol μ or β) is the rest mass of the proton (a baryon found in atoms) divided by that of the electron (a lepton found in atoms), a dimensionless quantity, namely: μ = mp /⁠ me = 1 836.152 673 426(32). The number in parentheses is the measurement uncertainty on ...

5. Atom - Wikipedia

   en.wikipedia.org/wiki/Atom

   Atom - Wikipedia ... Atom

6. Atomic nucleus - Wikipedia

   en.wikipedia.org/wiki/Atomic_nucleus

   Atomic nucleus - Wikipedia ... Atomic nucleus

7. Mass number - Wikipedia

   en.wikipedia.org/wiki/Mass_number

   Mass number - Wikipedia ... Mass number

8. Electron - Wikipedia

   en.wikipedia.org/wiki/Electron

   Electron - Wikipedia ... Electron

9. Atomic number - Wikipedia

   en.wikipedia.org/wiki/Atomic_number

   Atomic number - Wikipedia ... Atomic number