Atomic Theory

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Across
  1. 3. number protons + electrons
  2. 4. negatively charged particles in energy levels
  3. 6. discovered all matter is composed of atoms
  4. 10. discovered a positively charged nucleus with protons inside
  5. 11. discovered electrons
Down
  1. 1. discovered electrons orbit in energy levels
  2. 2. electrons electrons on the outermost ring
  3. 5. neutral charge particles in nucleus
  4. 7. are positively charged particles located in nucleus
  5. 8. number same as the number of protons and electrons
  6. 9. atoms of the same element that have a different number of neutrons and mass