Periodic Table Crossword

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Across
  1. 4. good conductor, shiny, ductile, malleable
  2. 6. semi-conductors, has some metal and nonmetal properties
  3. 7. the smallest particle in which an element can be broken down into
  4. 9. not malleable, not shiny, poor conductors, not ductile
  5. 10. groups 3-12
  6. 13. the columns in the Periodic Table
  7. 15. (H) (C) (O) (He) (Ne)
  8. 17. (H), one valance electrons
  9. 18. having a regular, repeated pattern
  10. 20. the rows in the Periodic Table
  11. 21. seventeenth group
  12. 22. number of protons and neutrons in an atom
  13. 24. (B) three valance electrons
Down
  1. 1. elements Actinium- Lawrencium
  2. 2. (N) five valance electrons
  3. 3. second group
  4. 5. first group
  5. 8. the electrons in the outermost energy level of an atom
  6. 11. number of protons in an atom's nucleus
  7. 12. eighteenth group
  8. 14. composed of two or more elements
  9. 16. elements Lanthanum- Lutetium
  10. 17. (He) two valance electrons
  11. 19. (O), six valance electrons
  12. 23. (C) four valance electrons