Across
- 4. Number of protons
- 6. Any of the possible energies an electron may have in an atom
- 8. Have no charge
- 9. Side that non-metals are found
- 10. Have a positive charge
Down
- 1. Last name of designer of the periodic table of elements
- 2. An electron in the outermost energy level of an atom
- 3. First name of designer of the periodic table of elements
- 5. Side that metals are found
- 7. Have a negative charge