Chemical

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