The Fundamentals of Chemistry

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Across
  1. 2. the emissions of radioactive particles
  2. 4. a highly conductive element
  3. 6. total number of protons and neutrons in a nucleus
  4. 7. formed when an atom gains an electron
  5. 10. the number of neutrons in a nucleus
  6. 13. a positively charged particle
  7. 15. formed when an atom loses an electron
  8. 16. when unstable atoms lose energy by radiation
  9. 18. rare earth metals
  10. 21. all are radioactive
  11. 23. elements on the right side of the periodic table
  12. 24. an uncharged particle
  13. 25. the number of protons in a nucleus
Down
  1. 1. a row of chemical elements in the periodic table
  2. 3. reactive with Group 17
  3. 5. good conductors
  4. 8. VERY stable, colorless and odorless
  5. 9. a negatively charged particle
  6. 11. formed when an atom gains or loses 1 or more electrons
  7. 12. a column of elements in the periodic table
  8. 14. an element with properties between metals and nonmetals
  9. 17. VERY reactive with Groups 1 and 2
  10. 19. found in the center of an atom
  11. 20. VERY reactive with Group 17
  12. 22. model predicts where electrons will move