Atomic Theory and the Periodic Table

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Across
  1. 3. representation of the valence electrons for an element
  2. 5. a horizontal row on the Periodic Table; same number of electron shells
  3. 7. substance that can conduct electric currents under some conditions but not others; used in computer chips, solar cells
  4. 12. an electron on the outermost shell, have the highest energy
  5. 14. shiny and reflective
  6. 15. the experiment where a green beam bent towards a positively charged plate
  7. 16. the experiment where positively charged alpha particles mostly went straight through the foil but some deflected
Down
  1. 1. substance composed of atoms of 2 or more elements bonded together
  2. 2. the center of the atom where all mass is located
  3. 4. a positively charged subatomic particle with 1 amu mass, located in the ceter
  4. 6. a vertical column on the Periodic Table; same number of valence electrons, same chemical properties
  5. 8. ability to be hammered/rolled into flat sheets or shapes
  6. 9. ability to pull/draw out a material into long, thin wires
  7. 10. the ease and speed that an element combines/reacts with other substances
  8. 11. a neutrally charged subatomic particle with 1 amu mass, located in the center
  9. 13. a negatively charged subatomic particle with negligible mass, located outside the center