ATOM

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Across
  1. 2. The tiny building block of all matter.
  2. 4. Ancient Greek who first thought of the "atom" idea.
  3. 7. positive center of an atom
  4. 8. A tiny particle with a negative charge.
Down
  1. 1. Something that is impossible to divide or exhange further.
  2. 3. someone who discovered electrons and proposed the "plum pudding" model.
  3. 5. someone who proved atoms exist and created the first atomic theory.
  4. 6. someone who discovered the nucleus using his gold foil experiment.