| A | B |
|---|
| Number of electrons in neutral lead atom | 82 |
| number of protons in neutral aluminum atom | 13 |
| mass number of magnesium | 24 |
| number of electrons in a calcium ion | 18 |
| number of neutrons in an phosphorus atom | 16 |
| number of neutrons in a calcium ion | 20 |
| number of protons in a calcium ion | 20 |
| number of protons in an iron atom | 26 |
| number of electrons in a neutral iron atom | 26 |
| number of protons in an fluorine atom | 9 |
| number of neutrons in a fluorine atom | 10 |
| atomic number of sodium | 11 |
| mass number of sodium | 23 |
| number of electrons in a neutral atom of sodium | 11 |
| number of neutrons in a sodium atom | 12 |
| number of protons in sulfur | 16 |
| number of electrons in a chlorine ion | 18 |
| number of protons in a chlorine ion | 17 |
| atomic number of lead | 82 |
| number of neutrons in lead | 125 |
