| Question | Answer |
| neutron, proton, electron | 1
|
number of protons | 2
| electrons in the outermost energy level/shell | 3
| 7 | 4
| False: in a neutral atom, the number of electrons equal the number of protons, which can be determined by the atomic number | 5
| D | 6
| 8 | 7
| C | 8
| False: in a neutral atom, the number of electrons equal the number of protons. If an atom loses electrons then the atom has more protons (+) and the resulting overall charge will be positive (+) | 9
| Atom A & Atom C (both have 8 protons) | 10
| B | 11
| C | 12
| B | 13
| B | 14
| 15 | 15
| Isotopes are atoms of the same element with the same number of protons but different number of neutrons | 16
| B | 17
| 48 | 18
| 20 | 19
| Neon | 20
| 4 protons, 5 neutrons, 4 electrons | 21
| True: in a neutral atom, the number of electrons equal the number of protons. If an atom gains electrons then the resulting overall charge will be negative (-). | 22
| Atom A & Atom B (both have 6 protons) | 23
| The overall charge would be 3- | 24
| Sodium is a metal, has 11 protons/electrons, has 12 neutrons, has 1 valence electron. Bromine is a non-metal, has 35 protons/electrons, has 45 neutrons, has 7 valence electrons. | 25
| Magnesium lost two electrons | 26
| Picture | 27 |
