| A | B |
|---|
| Number of neutrons in Carbon-13 | 7 |
| Element that has 5 protons and 6 neutrons. | Boron |
| Element with an average of 0 neutrons | Hydrogen |
| Number of protons in sodium | 11 |
| Number of electrons in a magnesium atom | 12 |
| An atom with 82 protons and 125 neutrons | Lead-207 |
| An atom with 82 protons and 127 neutrons | Lead-209 |
| Number of neutrons in Xenon-132 | 78 |
| Number of protons in Gold | 79 |
| Potassium-40 has ___ more protons than Potassium-39. | 0 |
| Potassium-40 has ___ more neutrons than Potassium-39. | 1 |
| An element with mass number of 223 and 136 neutrons | Francium |
| Number of protons in Europium | 63 |
| Number of neutrons in Nickel-60 | 32 |
| How many neutrons are in Iron 56? | 30 |
