1. 2
2. 3
3. 3
4. 1
5. 2
6. 1
7. 1
8. 1
9. 1
10. 1
11. 1
12. 1
13. 4
14. 4
15. 3
16. 3
17. 3
18. 1
19. 2
20. 4
21. 2
22. Y
23. gold foil experiment, alpha particles were "shot" at gold foil, the nucleus is small dense and positive & volume is mostly empty space
24. H and He
25. electrons move from an excited state to a ground state releasing energy
26. [(19.91 x 10.01) + (80.09 x 11.01)] / 100
27. 18 electrons, potassium ion has one less shell than a potassium atom, positive charge
28. the three isotopes of Ne have the same number of protons and different number of neutrons
29. [(19.99 x 90.9) + (20.99 x 0.3) + (21.99 x 8.8)] / 100
30. 20
31. volume is empty space
32. the nucleus is small dense and positive
33. volume is mostly empty space the nucleus is small and positive