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Across
  1. 3. -The ancient Greek idea that all matter is made of small particles.
  2. 4. - Dalton's model described the atom as an extremely small and indivisible
  3. 7. -The scientist who stated that atoms of the same element are identical.
  4. 8. -The negatively charged particle discovered by JJ Thomson.
  5. 9. -The Greek word used by Democritus meaning "indivisible."
  6. 10. - The physicist who discovered the nucleus through the gold foil experiment.
Down
  1. 1. -The dense, central core of an atom containing positive charges.
  2. 2. -This value refers specifically to the number of protons in an atom.
  3. 5. -The model proposed by JJ Thomson depicting electrons embedded in a positive sphere.
  4. 6. sum of protons and neutrons in an atom