Study Guide, Part A (Crossword puzzle)

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Across
  1. 2. groups 3-12 on the periodic table which are good conductors
  2. 5. elements 57-71 on the periodic table which are rare earth metals
  3. 6. group 2 on the periodic table which is reactive with group 17, but less reactive than group 1
  4. 8. the process by which unstable atoms become more stable by emitting particles and radiation
  5. 10. an atom of the same element that has a different number of neutrons
  6. 13. the number of protons in the nucleus of an atom
  7. 14. most of the elements on the periodic table which have properties that are opposite of nonmetals
  8. 17. negatively charged particles
  9. 18. positively charged particles
  10. 19. the elements to the right side of the periodic table which have properties that are the opposite of metals
  11. 22. the center of an atom
Down
  1. 1. an atom that loses one or more electrons
  2. 3. the elements that have properties of both metals and nonmetals
  3. 4. the process by which atoms produce energy and particles
  4. 7. group 17 on the periodic table which is reactive with groups 1 and 2
  5. 9. group 1 on the periodic table which is very reactive with group 17
  6. 11. the area around the center of an atom where negatively charged particles circulate
  7. 12. a horizontal row on the periodic table
  8. 15. uncharged or neutrally charged particles
  9. 16. an atom that gains one or more electrons
  10. 19. gases group 18 on the periodic table which is very stable, colorless and odorless, and also called inert gases because they almost never react with other elements
  11. 20. the total number of protons and neutrons in an atoms nucleus (use the abbreviation)
  12. 21. a vertical column on the periodic table