Atomic Theory

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Across
  1. 2. Credited with cohesive modern atomic theory.
  2. 5. Experiment: demonstrated subatomic particles.
  3. 7. Has mass but no charge.
  4. 8. Has charge but no mass.
  5. 10. First model to show a nucleus.
  6. 12. Mass of 1 unit.
Down
  1. 1. Experiment: Atom is mostly empty space.
  2. 3. Particle attracted to a positive plate.
  3. 4. Particle attracted to a negative plate.
  4. 6. Credited with the first idea of the atom.
  5. 9. # protons in gallium.
  6. 11. Fluorine has a mass of 19 and has ___neutrons.