Chemistry Review

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Across
  1. 4. The number of protons in the element.
  2. 5. A diagram that shows only the valence electrons.
  3. 7. Two or more different atoms bonded together.
  4. 13. The Law of ____ of mass says that matter cannot be created or destroyed.
  5. 14. A pure substance that cannot be broken down to simpler substances.
  6. 15. An element with 25 protons.
  7. 16. Materials that allow heat to easily flow through.
  8. 18. The number of protons plus neutrons.
  9. 21. A particle in the nucleus with no charge.
  10. 25. A change that only changes how something looks.
  11. 26. A drawing of each ring of electrons.
  12. 30. In covalent bonds, the elements _____ electrons.
  13. 31. Elements with 7 valence electrons.
  14. 33. An element with 114 neutrons.
  15. 35. The inner shell can hold ___ electrons.
  16. 36. The Earth Metals in the second group.
  17. 37. Every living thing is mainly made of these 4 elements.
Down
  1. 1. The electrons on the outermost shell.
  2. 2. A bond between a metal and non-metal.
  3. 3. New substances are formed in a _____ reaction.
  4. 6. Elements that do not react with anything.
  5. 8. How shiny an element is.
  6. 9. This element was once called Wolfram.
  7. 10. A negative particle orbiting the nucleus.
  8. 11. Two or more different elements combined.
  9. 12. Can be separated.
  10. 17. Metals that are the most reactive.
  11. 19. An atom of the same element with a different number of neutrons.
  12. 20. An element with 74 neutrons.
  13. 22. One or two letters that represent an element.
  14. 23. ______ are made of mostly four elements.
  15. 24. The chemical found in hot peppers.
  16. 27. A bond between two non-metals.
  17. 28. A particle in the nucleus with a positive charge.
  18. 29. Elements found on the "stairs" of the table.
  19. 32. Carbon in its ordinary form is _____
  20. 34. The person who created the Periodic Table.