Atomic Structure: structures evolved over time
Dalton (1803): Cannonball Theory
*elements are made of atoms
*atoms of elements are the same
*compounds are formed by combining atoms
*atoms of elements are the same
*compounds are formed by combining atoms
*electrons have a negative charge
*electrons are embedded in atom 
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Rutherford (1911): Gold Foil Experiment
*+ charged alpha particles shot at gold foil
*some were deflected
*some went straight through
*some were deflected
*some went straight through
Conclusion:
1. atom made up of + charged nucleus
2. atom made up of mostly empty space
Bohr (1913) Planetary Model
*PEL's - Principle Energy Levels
*rings of orbiting electrons surrounding a nucleus containing protons and neutrons
*rings of orbiting electrons surrounding a nucleus containing protons and neutrons
Wave-mechanical Theory (1926) Electron Cloud
*an orbital is the location where there is a high probability of finding an electron.
