Ch.9 Atomic Structure

2. Universe was made of empty space and tiny bits of stuff
5. Varying density shows where an electron is more or less likely to be
8. have no electrical charge Located in the nucleus of the atom
9. often used for things that are too small or too large to be observed or that are too difficult to be understood easily
10. Electrons move in definite orbits around the nucleus
12. Mass Number equal to the number of protons plus neutrons.
14. Number number of protons
15. Demonstrated that burning wood caused no change in mass

1. Plum pudding model
3. All elements are composed of indivisible particles.
4. Mostly empty spacesmall, positive nucleus Contained protons negative electrons scattered around the outside
6. levels any of the possible energies an electron may have in an atom.
7. have a positive charge (+)Located in the nucleus of the atom
11. Have a negative electrical charge (-)Move around the outside of the nucleus
13. Discovered the neutron
14. Weight average mass of the naturally occurring isotopes of an element .