Atoms and the periodic table Crossword

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Across
  1. 1. Substance that cant be separated or broken.
  2. 3. Earth Metal/In group 2.
  3. 4. Good Conductors of thermal energy.
  4. 8. protons different neutrons.
  5. 9. Conductors.
  6. 10. group 17.
  7. 13. of 2 or more elements.
  8. 14. Charged particles.
  9. 16. no charge.
  10. 20. both properties.
Down
  1. 2. or core.
  2. 5. Particle.
  3. 6. Number/Neutron+Protons.
  4. 7. Row.
  5. 11. Cloud/Likely where electrons found.
  6. 12. charged particles.
  7. 15. Mass/Weighed average of masses.
  8. 17. Gas/In group 18 nonreactive.
  9. 18. Metal/Metal In group 1.
  10. 19. Law/States that chemical and physical properties are periodic functions.