Across
- 1. 3D space where an electron is found most of the time
- 3. Located in the nucleus and contain a neutral charge
- 5. Number that defines the element
- 8. Atoms that join together
- 9. Element with a mass number of 35
Down
- 2. Atom of the same element that have different mass numbers due to the number of neutrons
- 4. The mass of protons and neutrons
- 6. Element that contains 5 electrons and 6 neutrons
- 7. atoms that decay and release particles and energy