Study Guide, Part A (Crossword puzzle)

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Across
  1. 3. the area around the center of an atom where negatively charged particles circulate
  2. 5. group 1 on the periodic table which is very reactive with group 17
  3. 7. negatively charged particles
  4. 8. groups 3-12 on the periodic table which are good conductors
  5. 13. the number of protons in the nucleus of an atom
  6. 16. group 2 on the periodic table which is reactive with group 17, but less reactive than group 1
  7. 20. 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
  8. 21. an atom of the same element that has a different number of neutrons
  9. 22. an atom that loses one or more electrons
  10. 23. the elements to the right side of the periodic table which have properties that are the opposite of metals
  11. 24. most of the elements on the periodic table which have properties that are opposite of nonmetals
  12. 25. an atom that gains or loses one or more electrons
Down
  1. 1. the elements that have properties of both metals and nonmetals
  2. 2. uncharged or neutrally charged particles
  3. 4. elements 57-71 on the periodic table which are rare earth metals
  4. 6. positively charged particles
  5. 9. the total number of protons and neutrons in an atoms nucleus (use the abbreviation)
  6. 10. an atom that gains one or more electrons
  7. 11. a vertical column on the periodic table
  8. 12. the process by which unstable atoms become more stable by emitting particles and radiation
  9. 14. a horizontal row on the periodic table
  10. 15. group 17 on the periodic table which is reactive with groups 1 and 2
  11. 17. elements 89-103 on the periodic table which are all radioactive
  12. 18. the center of an atom
  13. 19. the process by which atoms produce energy and particles