Fun Physical Facts

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Across
  1. 2. the smallest part of an element
  2. 3. model an atom was mostly empty space
  3. 7. any particle that was deflected strongly had been repelled by a gold atom's nucleus
  4. 8. model suggested that atoms negatively charged electrons embedded in a positive sphere
  5. 12. atoms have one proton in the nucleus.
  6. 13. level energy of each electron is kept in motion around the positive nucleus
  7. 14. model thought that atoms were like smooth, hard balls that could not be broken into smaller pieces
Down
  1. 1. model suggested that electrons move in specific orbits around the nucleus of an atom
  2. 2. number the number of protons in the nucleus of an atom
  3. 4. a negatively charged particle
  4. 5. atoms of the same element have different numbers of neutrons
  5. 6. number the sum of protons and neutrons in the nucleus of an atom
  6. 9. has no electric charge, it was nearly the same mass as a proton
  7. 10. positively charged particles in an atom's nucleus
  8. 11. model electrons move rapidly in all directions around the nucleus