Study Guide, Part A

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