| A | B |
|---|
| Wave Mechanical Model | Describes e- in motion and e- have a specific amount of energy |
| Orbital | region most likely to find an e- |
| electron cloud | region outside nucleus |
| John Dalton | described atom as a hard sphere |
| Niels Bohr | Planetary Model-e- are placed in electron shell |
| electron | 1/1836 amu, - charged and attracted to + object |
| neutron | 1 amu, neutral charge, located in nucleus |
| proton | + charge, 2000 x larger than e- |
| Mass Number | sum of protons and neutrons |
| Atomic Number | indicates # of protons in nucleus |
| nucleus | dense, + charged core of atom |
| Gold Foil Experiment | atom contained a + charged nucleus and has lots of empty space |
