Across
- 3. Negatively charged particle outside nucleus
- 4. Anything that has volume and mass
- 5. Center of an atom. Contains protons and neutrons
- 7. Same number of protons, but different neutrons
- 8. Can't be broken down into simpler substances
Down
- 1. Atom that has gained or lost an electron
- 2. Number of protons in an atom
- 4. Number of protons and neutrons in an atom
- 5. Found in nucleus. Has no charge
- 6. Found in nucleus. Has a positive charge