Siu

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Across
  1. 3. consists of two atoms
  2. 7. Horizontal list of words
  3. 8. A diagram that shows the arrangement of electrons in an atom
  4. 9. outermost electron shell
  5. 10. ____compound
  6. 12. _____diagram
  7. 15. Core of a atom
  8. 17. Having neither acid nor basic properties
  9. 18. in group 18
  10. 21. multiple atoms share electrons
  11. 25. ______nanotube
  12. 27. ___________electron
  13. 28. negative or positive charge
Down
  1. 1. ____table
  2. 2. vertical lists of elements
  3. 4. _____number
  4. 5. H
  5. 6. characterised of metals and non metals
  6. 7. 2 or more atoms that bond together
  7. 11. pure substance
  8. 13. Be
  9. 14. collection of elements
  10. 16. negatively charged ion
  11. 19. positively charged ion
  12. 20. 17 elements in periodic table
  13. 22. ____technology
  14. 23. a stable subatomic particle, symbol p
  15. 24. a negatively charged subatomic particle.
  16. 26. Ne