Study Guide, Part A (Crossword puzzle)

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