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Across 2. 146 neutrons and 92 electrons 3. light particle 7. element with an atomic number of 83 9. element with 30 protons 11. number of protons + neutrons 12. experiment Rutherford used to discover the nuclues 13. uncharged particle found in the nucleus 14. charged atoms 16. average atomic mass is 52.00 18. also known as the principal quantum number 21. found in the electron cloud 22. positively charged particle with a relative mass of 1 23. s, p, d, or f 24. visible color with lowest energy

Down 1. amount of energy required to move an electron from one energy level to the next 4. neutral atom of this element has 11 electrons 5. element with no neutrons 6. number of protons only 7. scientists who proposed electrons follow specific paths or orbits 8. atoms of elements that have different atomic mass and number of neutrons 10. the -1 charged ion for ths element would have 18 electrons 14. element with 26 protons 15. shape of s-orbital 17. element symbol is Hg 19. lightest noble gas 20. visible color with high energy