| 1 | So we get at the number of neutrons indirectly because we know the proton number here. | |
| 2 | Quarks are the constituents of protons and neutrons, as well as more exotic things. | |
| 3 | The advantage of hydrogen is its unrivalled simplicity: one electron circles a single proton. | |
| 4 | When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino. | |
| 5 | Sodium ions are much larger than protons, so they take longer to cross once they enter. |
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