Elements and the Periodic Table

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Across
  1. 2. particle with no charge
  2. 3. atoms with the same number of protons and a different number of neutrons
  3. 5. elements in group 17 of the periodic table
  4. 6. element that is a poor conductor of electricity and is reactive with metals
  5. 8. average mass of all isotopes of that element
  6. 11. the process of destruction of a metal
  7. 13. the metals of group 1 in the periodic table
  8. 15. sum of the number of protons and neutrons in the nucleus
  9. 17. organized representation of all elements
  10. 19. particle with a negative electric charge
  11. 20. the ability to combine with other elements and compounds
  12. 22. elements in group 18 that are usually unreative
  13. 24. very small center core of an atom
  14. 25. the ability to transfer heat to another object
  15. 27. class of elements characterized by shininess, malleability, ductility and conductivity
Down
  1. 1. the metals of groups 3-12 on the periodic table
  2. 4. an element that consists of two atoms
  3. 7. the vertical columns on the periodic table
  4. 9. the metals of group 2 in the periodic table
  5. 10. the ability to be hammered into flat sheets
  6. 12. elements with characteristics of both metal and nonmetals
  7. 14. one or two letter representation of each element
  8. 16. particle with a positive electric charge
  9. 18. the horizontal rows on the periodic table
  10. 21. mixture of a metal with at least one other element
  11. 23. the number of particles in the nucleus that is unique to each element
  12. 26. the ability to be drawn into a long wire