Across
- 4. smallest unit of matter
- 6. part of the atom with no charge
- 8. negatively charged part of an atom
- 9. a substance made of just one type of atom
- 10. the # of protons that is equal to the # of electrons
Down
- 1. positively charged part of an atom
- 2. the letters that represents the element
- 3. name of the element
- 5. the number of protons + neutrons
- 7. center of an atom