Across
- 2. includes Sodium
- 7. nickname for the periodic table
- 10. Tabular arrangement of chemical elements that is arranged by increasing atomic number and groups
- 11. no charge
- 12. pioneered the theory of atomism
- 14. includes Neon
Down
- 1. includes Barium
- 3. first element
- 4. includes Cobalt
- 5. includes Iodine
- 6. negative charge
- 7. has a positive charge
- 8. The 5th element of the PTE
- 9. developed the Bohr model of the atom
- 13. the smallest unit of ordinary matter