Atoms & The Atomic Theory

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Across
  1. 1. Particle with a positive electric charge
  2. 3. Pathways around the nucleus electrons follow
  3. 6. Atoms with different numbers of neutrons
  4. 9. Greek philosopher that said all matter is made of tiny particles called "atomos" or atoms
  5. 11. A 'fuzzy' region around the nucleus with electrons
  6. 13. Particle with neutral electric charge
  7. 16. Number of protons and neutrons in the nucleus of an atom
  8. 17. the number of protons in the nucleus of an atom
  9. 19. Discovered the nucleus
Down
  1. 2. The positively charged center part of an atom
  2. 4. Shows with electrons in circular orbits
  3. 5. Changing one element to another
  4. 7. Particle with a negative electric charge
  5. 8. The joining of atomic nuclei
  6. 10. A charged atom with too many or too few electrons
  7. 12. A pure substance made of only one kind of atom
  8. 14. Particles given off by unstable atoms
  9. 15. Electrons on the outside energy shell
  10. 16. Smallest piece of an element
  11. 18. The splitting of an atomic nucleus