A conservator detects two types of nucleus in a metal artefact.
| Nucleus | Mass number | Number of neutrons |
|---|---|---|
| P | 63 | 34 |
| Q | 65 | 36 |
What can be concluded about nuclei P and Q?
They are isotopes of the same element, and the nuclei contain 34 and 36 protons.
They are different elements, because the nuclei contain 34 and 36 neutrons.
They are different elements, and the nuclei contain 63 and 65 protons.
They are isotopes of the same element, and each nucleus contains 29 protons.