| A | B |
|---|
| Number of protons in sodium, Na | 11 |
| Number of electrons in sodium, Na | 11 |
| Number of neutrons in sodium, Na | 12 |
| Number of protons in potassium, K | 19 |
| Number of neutrons in potassium, K | 20 |
| Number of electrons in potassium, K | 19 |
| charge of proton | 1+ |
| charge of neutron | 0 |
| charge of electron | 1- |
| location of proton | nucleus |
| location of neutron | nucleus |
| location of electron | electron cloud |
| Atomic Mass is equal to the number of ... | protons and neutrons |
| Mass of a proton | 1 amu |
| Mass of an electron | 1/1800 amu |
| Mass of a neutron | 1 amu |
| Discovered the electron | JJ Thomson |
| Discovered the nucleus | Ernest Rutherford |
| Discovered the proton | Ernest Rutherford |
| Discovered that atoms are mostly empty space | Ernest Rutherford |
| Discovered the neutron | James Chadwick |
| Which parts of the atom identifies the atom | the number of protons |
| The number of protons in copper | 29 p+ |
| Neutral atoms have the same number of | protons and electrons |
| The number of protons in boron, B | 5 p+ |
| The number of electrons in a neutral atom of Chlorine, Cl | 17 e- |
