Chapter 10 Crossword

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Across
  1. 1. group 17
  2. 3. the central core of an atom
  3. 6. how easily the element reacts with other elements
  4. 7. groups on the periodic table that classifies elements depending on their properties
  5. 8. a particle with no charge
  6. 10. the horizontal rows of the periodic table
  7. 12. a particle that gives the nucleus it's positive charge
  8. 13. the sum of the number of protons and the number of neutrons
  9. 15. a particle that moves around the nucleus forming a cloud of negative charge
  10. 16. the elements located along the right side of the stair-step line
  11. 18. groups 3-12
  12. 20. similar to each other in their properties
Down
  1. 2. group 18
  2. 4. the region around the nucleus occupied by electrons
  3. 5. an average of the masses of all the isotopes that occur in nature for that element
  4. 9. atoms of the same element with different numbers of neutrons
  5. 11. have five or more electrons in their outer energy level
  6. 14. the number of protons in an atom
  7. 17. a table of elements classified by their properties
  8. 19. the smallest particle of any element that has the properties of that element