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Across 6. glass tube used by J J Thompson. 8. credit goes to John Dalton. 10. Presented atomic theory. 11. Electron carries this. 16. atoms have a nucleus. 18. Discovered electron. 23. non-metals do this. 25. atoms can have different number of this when isotopes. 28. atoms have different number of this if they make ions. 31. radioactive elements. 32. First energy level/orbit can have. 33. to get this , subtract atomic number from mass number. 34. central part of an atom.

Down 1. atoms having same atomic number but different atomic mass. 2. Number of protons determines this. 3. when an atom gains an electrons it is formed. 4. when protons and electrons are equal in number. 5. when an atom loses an electron makes. 7. metals do this 9. make cation. 12. Second orbit can hold up to. 13. isotope of carbon used for carbon dating. 14. determined by number of protons. 15. protons and neutrons compose this. 17. charged atom. 19. protons and neutraon are called. 20. most common isotope of carbon. 21. sum of protons and neutrons. 22. make anion. 24. Subatomic particles , with positive charge. 26. THe first person who gave an idea about atom. 27. Gave the concept of orbit. 29. noble gases have this type of atoms. 30. Neutral subatomic particles.