| A | B |
|---|
| Isotopes | Atoms of the same element with different numbers of neutrons |
| Subatomic particle with a negative charge | electron |
| neutral subatomic particle | neutron |
| positively charged subatomic particle | proton |
| quark | small subatomic particle making up protons and neutrons |
| Plum pudding model of the atom | Thomson |
| Bee Hive Model of the atom | Rutherford |
| Quantum Mechanical Model of the Atom | Current Model; Mathematical model |
| Planetary model of the atom | Bohr |
| nucleus | very small, very dense center of the atom |
| An atom with 12 protons | magnesium |
| An atom with 8 electrons | oxygen |
| An atom with 10 protons | neon |
| Atomic number | the number of protons in the nucleus |
| Atomic mass | average of all of the isotopes of an element |
| Mass number | total number of protons + neutrons |
