Across
- 2. an atom with the same # of protons but different # of neutrons
- 4. what element has the symbol O
- 6. positive charged particle in atoms
- 8. dense center of an atom
- 9. The smallest particle that still can be an element
Down
- 1. an idea or thought
- 3. negative charged particle in atoms
- 5. the number of protons
- 7. sum of protons and neutrons
- 8. Has no electrical charge