B3 Chap8 Xword note

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Across
  1. 3. In general, the density and reactivity _ as we go down group 1 & 2.
  2. 4. Important to prevent tooth decay.
  3. 6. Main component found in modern rechargeable batteries.
  4. 7. Group 7 elements are also called _.
  5. 9. Our current periodic table is sorted by _ number.
  6. 10. Group 8 elements are also called _ gases.
  7. 14. The modern periodic table is based on the work of _.
  8. 16. In general, the density of group 2 elements _ as we go down the group.
  9. 17. Krypton and Xenon are used to produce _ and high intensity light.
  10. 20. Each row in the periodic table is called _.
  11. 21. Johann Wolfgang Dobereiner sorted out the 12 elements known during his time into _.
  12. 23. During John Dalton's time, he arranged the elements by atomic _.
  13. 25. As you go _ the period from left to right, elements change from being metals to non-metals.
  14. 26. Used in lights for advertising display.
Down
  1. 1. Found naturally in emerald and aquamarine.
  2. 2. Group 8 elements are very _. They do not take part in any chemical reactions.
  3. 5. Group 2 elements are known as _ metals.
  4. 8. The most common element found in the universe.
  5. 11. John Newland devised the "law of _" to explain his discovery.
  6. 12. Group 1 elements are known as _.
  7. 13. In general, the melting and boiling point of group 1 & 2 elements _ as we go down the group.
  8. 15. _ were left in the Mendeleev table to account for potentially new elements.
  9. 18. Hydrogen gas can be identified in the lab because it produces "_" sound when burned, as there's a small explosion.
  10. 19. Hydrogen is a clean fuel because it produces only _ when burned.
  11. 20. The atomic number tells us the number of _ in an atom.
  12. 22. Used in wire-filament light bulbs to ensure longevity.
  13. 24. Each column in the periodic table in known as _.