Across
- 3. mass protons and neutrons in the nucleus
- 7. middle of the periodic table
- 10. chemical reaction with another atom
- 11. positive charge
- 13. same number of valence electrons
- 15. left side of the periodic table
- 17. Protons and neutrons are inside
- 18. negative charge
- 19. basic building blocks of all matter
Down
- 1. shaped by forging
- 2. conducts heat and electricity
- 4. takes up space and has volume
- 5. gradual changes left to right
- 6. outside the nucleus
- 8. reflects light
- 9. similar chemical properties and physical properties
- 12. atoms have the same number of valence electrons
- 14. Has no charge
- 16. number of protons in an atom
- 17. right side of the periodic table