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Across 5. Charge of an atom 7. Discovered the cathode ray 8. Discovered that atoms could be split 9. Discovered the neutrons 12. Came up with the idea of electrons after the cathode-ray experiment 13. Did not believe the idea of atoms-disbelief lasted for 2,000 years 15. The smallest particle of an element that retains the properties of the element 16. Came up with the name "atomos" 18. 1/12 of carbon 12 19. Subatomic particle with a negative charge 21. Element with an atomic mass of 200.59 22. Subatomic particle with a positive charge 23. Came up with the Plum Pudding model

Down 1. Is the same as the number of protons 2. Atomic theory 3. Came up with idea of where the electrons where arranged on an atom 4. If you add the protons and the neutrons together 6. Charge of an eletron 10. Gold foil experiment discovered the nucleus 11. Has the same number of protons but different number of neutrons 14. Element with 35 protons 17. Electrons that are on the last "shell" of the atoms and determines the characteristic of the atom. 20. Subatomic particle with no charge