Study Guide, Part A (Crossword puzzle)

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