| Questions | Answers |
|---|---|
| Who first theorized the existence of atoms? | Democritus |
| Who discovered neutrons? | Chadwick |
| Which of the following has a negative charge? | Electron |
| What determines an element's atomic number? | sProton |
| If an ion contains 10 electrons, 12 protons, and 13 neutrons, what is the ion's charge? | 2+ |
| What determines the identity of an element? | Number of protons |
| Which part of an atom makes up most of the volume? | nucleus |