Across
- 3. Who Discovered that matter is composed of tiny particles?
- 4. Which electron shell is most important in determining how an element will react?
- 8. Who discovered it's impossible to know the momentum of an electron and its exact position?
- 12. What element has a symbol that looks like this Hg?
- 16. Which shell contains 19-20 electrons?
- 18. What a symbol stand for
- 19. Who proposed the law of conservation of mass
- 21. who determined that elements exist?
- 23. What element has a symbol that looks like this Po?
- 24. Who discovered mass of rays?
- 25. Who discovered what electrons do?
Down
- 1. Which shell contains 1-2 electrons?
- 2. What element has a symbol that looks like this Pu?
- 5. What element has a symbol that looks like this As?
- 6. What element has a symbol that looks like this Fr?
- 7. Who discovered what and where the nucleus and protons are?
- 9. Who proved the existence of atoms?
- 10. What is the smallest form of a chemical particle that retains the properties if the particle?
- 11. What element has a symbol that looks like this Pb?
- 13. Which shell contains 11-18 electrons?
- 14. Which shell contains 3-10 electrons?
- 15. What is a number assigned to a particular atom called?
- 17. What defines the characteristics of each element?
- 20. Who developed the theory of Atomism?
- 22. What is the mass of an ato, called?