The Periodic Table

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Across
  1. 2. Iron
  2. 7. horizontal rows of elements in the periodic table of chemical elements
  3. 8. a single atom
  4. 10. Period 2, Group 16
  5. 15. the arrangement of elements into a table according to their chemical properties
  6. 17. group of two or more atoms that are bonded together
  7. 19. Period 1, Group 18
Down
  1. 1. Period 1, Group 1
  2. 3. pure substance made up of only one type of atom
  3. 4. smallest particle of matter that cannot be created, destroyed or broken down
  4. 5. long chain molecule made up of many simpler repeating units
  5. 6. Period 2, Group 15
  6. 9. Perion 4, Group 11
  7. 11. vertical columns of elements in the periodic table of chemical elements
  8. 12. Silicon
  9. 13. Sodium
  10. 14. a molecule that contain two or more different atoms bonded together
  11. 16. Period 5, Group 7
  12. 18. Aluminium
  13. 19. Mercury