Atom

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Across
  1. 2. A column in the periodic table.
  2. 6. Path electrons take around the nucleus (Bohr model).
  3. 8. The modern model of the atom focuses on probabilities.
  4. 9. Refers to the repeating patterns in the periodic table.
  5. 12. The dense center of an atom.
  6. 14. Rearranged the periodic table by atomic number.
  7. 16. Proposed the first atomic theory based on experimentation.
  8. 17. Refers to atomic mass in the periodic table.
  9. 19. Neutral particle in an atom's nucleus.
  10. 20. Discovered the nucleus through the gold foil experiment.
Down
  1. 1. Refers to atomic number, the number of protons in an atom.
  2. 3. Positively charged particle in an atom.
  3. 4. A row in the periodic table.
  4. 5. Ancient Greek philosopher who proposed atoms.
  5. 7. Discovered the electron; proposed the plum pudding model.
  6. 10. Created the first periodic table based on atomic mass.
  7. 11. Negatively charged particle in an atom.
  8. 13. The smallest unit of matter.
  9. 15. A pure substance consisting of only one type of atom.
  10. 18. Proposed that electrons move in specific energy levels.