| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | proton | physics community | Positively charged subatomic particle found in the atomic nucleus | 1 |
| 2 | protons | physics community | Protons have a positive electric charge and are found in the nucleus of an atom. | 1 |
| 3 | protons | physics community | Positively charged subatomic particles found in the nucleus of an atom. | 1 |
| 4 | quark | physics community | Fundamental particle and building block of protons and neutrons | 1 |