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Across
  1. 6. found in column
  2. 7. metals, are very reactive
  3. 8. number, tell you how many protons a atom of a element has
  4. 11. the center of a atom
  5. 12. metals, generally less reactive
  6. 16. have properties of both metals and nonmetals
  7. 17. same element but different number of electrons
  8. 18. a series with 15 elements
  9. 19. have a positive charge
  10. 21. same element but different mass
  11. 23. very reactive nonmetals
  12. 24. metals, less reactive earth metals
Down
  1. 1. atoms produce energy and heat
  2. 2. located in rows on the periodic table
  3. 3. the total number of protons and neutrons in a atom
  4. 4. has a negative charge
  5. 5. ion, if an atom loses a electron then it becomes what
  6. 9. element that conducts electricity and heat
  7. 10. are rare earth elements
  8. 11. has no charge
  9. 13. gases, gas that almost never reacts with other elements
  10. 14. decay, the number of protons changes
  11. 15. ion, when a electron is added
  12. 20. is the opposite of metal
  13. 22. cloud, shows all place that electrons would be