8th Science Crossword Puzzle

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Across
  1. 4. Pure forms are shiny and silvery, Group 2
  2. 5. Small piece of something
  3. 6. Energy level showing the distance between an electron and the nucleus
  4. 14. (+) charge
  5. 16. Negatively charged space around the nucleus
  6. 18. Subatomic particle with a positive charge
  7. 19. Very reactive family in the Periodic Table, Group 1
  8. 20. Smallest unit of an element
  9. 21. Center of the atom, filled with protons and neutrons
Down
  1. 1. Extremely non-reactive, Group 18
  2. 2. Usually shiny, hard, malleable,good conductors
  3. 3. (o) charge
  4. 7. (-) charge
  5. 8. Subatomic particle with a neutral charge
  6. 9. Horizontal lanes in the Periodic Table
  7. 10. Largest family in the Periodic Table
  8. 11. Partial conductors, share properties of both metals and non-metals
  9. 12. Usually brittle, not ductile, poor conductors
  10. 13. Vertical lanes in the Periodic Table
  11. 15. Subatomic particle with a negative charge
  12. 17. Very reactive with 1 and 2 groups, Group 17