Study Guide, Part A (Crossword puzzle)

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