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Across 4. First thought of by Democritus 6. Atomic decay 8. Physics at the atomic level (2 words) 10. The simplest element 11. Unballanced atom 13. The first transition metal 14. Has 99.9% of an atoms mass 16. Used in ceramics batteries, and lubricants 17. It is impossible to measure both a particle's position and velocity exactly (2 words) 18. Types of quarks 19. Diffrent atoms of the same element 20. Negitive part of an atom 25. Hold electrons to nuclei (2 words) 26. Conducted the gold foil experement (2 words) 28. Larger than a proton or electon 29. Discovered that particles can act like waves (2 words)

Down 1. Discovered the electron (2 words) 2. p+ 3. Can view an atom (3 words) 5. Measures the mass of an atom (2 words) 7. Found barium (2 words) 9. Discoverd that electons can change orbits (2 words) 12. Be 14. Atomic Mass: 14.00674 amu 15. The gas used in ballons 21. Atomic Number: 8 22. Makes up neutrons and protons 23. From the latin word argentum 24. Au 27. Pb