Matter

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Across
  1. 3. Responsible for current flow
  2. 7. Process of losing or gaining an electron
  3. 11. Has Mass and Occupies space
  4. 13. Neutral charged particle
  5. 14. Path of electron as it moves around nucleus
  6. 16. The centre of an Atom
  7. 17. Force that holds Atom to Atom together
  8. 19. Insulator made from Silica
  9. 20. Positively charged particle
Down
  1. 1. Negatively charged particle
  2. 2. Element with less than half its valence shell filled is most likely
  3. 4. Has 4 Valence Electrons
  4. 5. Has few free Electrons
  5. 6. Used for Motor brushes
  6. 8. Furthest orbit from the Nucleus
  7. 9. Outermost shell
  8. 10. An electron that can move from Atom to Atom
  9. 12. Has unique number of protons
  10. 15. Used in Electrical equipment
  11. 18. Excellent conductor of Electricity