A Chemistry Crossword

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Across
  1. 3. neutrons, protons, electrons
  2. 4. element that is non-metal and non-reactive
  3. 7. a group of elements in between metals and non-metals
  4. 8. a group of elements that are metals and very reative
  5. 12. number of __________, are achieved by subtracting the atomic mass by the atomic number
  6. 13. irreversible change
  7. 14. reversible change
  8. 15. the elements metal + non-metal combined
  9. 18. theories/predictions made about the atom
  10. 21. a physical characteristic that a substance can have which means to conduct an electric current
  11. 22. periodic table of _________, substance that cannot be broken down any further
  12. 24. mass of one atom in a given element
Down
  1. 1. shininess of a substance
  2. 2. a homogeneous mixture
  3. 5. process of solid turning into gas
  4. 6. used at the ending when naming a molecular compound
  5. 9. the elements non-metal + non-metal combined
  6. 10. time period where controlling fire was learned
  7. 11. system designed to help people against harmful substances
  8. 14. meaning 5 in terms of naming molecular compounds
  9. 16. created by an alchemist to create casts
  10. 17. a positively charged ion
  11. 19. heat exiting- fire
  12. 20. heat entering- cool pack
  13. 23. a column in the periodic table with elements with similar traits