Periodic Table

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Across
  1. 4. a particle which is neutral in the atom
  2. 7. Models Show the atomic structure of an atom
  3. 8. number used to tell the number of protons in an element
  4. 10. Vertical columns on the periodic table
  5. 12. broken down into regions of space and is negatively charged
  6. 15. A particle in the nucleus that is positively charged
  7. 16. Located on the left of metalloids
  8. 17. Uses symbols to show the number of atoms of each element
  9. 19. was the first to develop a periodic table that was organized by atomic mass
  10. 20. Elements in group 17 fall under this category
Down
  1. 1. discovered that the number of protons is unique to each of the elements
  2. 2. an element that can make up coal and methane gas
  3. 3. Was the first to name the atom
  4. 5. are poor conductors and are gases
  5. 6. what element is used to get bacteria out of pools
  6. 9. Made up of protons and neutrons and is where the mass is located
  7. 11. are solids and have physical properties
  8. 13. the force between the nucleus and electron cloud
  9. 14. element that is common in food
  10. 18. Horizontal rows on the periodic