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Name: Period: Atomic Theory Crossword Across 4. Who determined the plum pudding was wrong? 8. Thomson was able to discover the existence of electrons by using a 10. Which theorist was an English school teacher? 12. Neutral subatomic particle. 13. Positively charged subatomic particle. 16. The earliest record of atomic theory was developed by this person. 17. Theories can be changed or ray. as new information becomes available. 18. Millikan is credited for determining the charge of a(n) 20. Electrons have a charge. 22. Neutrons were discovered by this theorist. 23. The planetary model was named because it represents the 24. Protons and neutrons have nearly the same . 25. Protons are located the nucleus. 26. This man is credited for the discovery of the electron. . system. Down 1. In a chemical reaction, atoms are combined, or rearranged. 2. The proton was discovered the electron. 3. The plum pudding model is also referred to as the chocolate chip _____model 5. Democritus' theory was rejected because it lacked . 6. The charge of an electron was determined through the oil experiment. 7. Electrons are than protons and neutrons. 9. Electrons are located the nucleus. 11. Democritus believed the universe is made up of tiny particles called . 13. The nucleus has an overall charge. 14. The Planetary model was developed by Rutherford and . 15. John Dalton's theory had this many parts. 19. The dense central core of the atom. 21. This man is credited for the discovery of the proton.