| A | B |
|---|
| If an oxygen atom has 8 protons and 8 neutrons in the nucleus, what is the mass number of oxygen? | 16 |
| If an oxygen atom has 8 protons and 8 neutrons in the nucleus, what is the atomic number? | 8 |
| If an atom has 12 electrons, what is its atomic number? | 12 |
| If an atom has 9 protons in its nucleus, how many electrons must it have? | 9 |
| Suppose I tell you that the mass number of an atom is 18 and the atom has 8 protons in its nucleus. What is the number of neutrons? | 10 |
| An atom has 14 electrons and a mass number of 27. How many neutrons does it have? | 13 |
| An atom has 17 electrons and a mass number of 35. What is its atomic number? | 17 |
| If an atom has 3 protons in its nucleus, how many electrons does it have? | 3 |
