Matter and Energy

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