Across
- 4. neutral charged particle inside the nucleus
- 5. positively charged core of an atom
- 6. atomic mass unit that measures the mass of a elements atomic mass
- 7. basic unit of a chemical element
- 9. basic part of a whole
Down
- 1. system of electrons surrounding the nucleus of an atom
- 2. positively charged particle inside the nucleus
- 3. negatively charged particle outside the nucleus
- 6. number of protons in a nucleus
- 8. shows all the different atoms on earth