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Atoms and Elements 2

Pearson Ch. 4 Sec. 1

Dalton Developed a model that described atoms as smooth, hard balls- included the idea that all atoms of an element are alike and different from atoms of any other element
Thomson Discovered electrons- Described an atom as a ball of positive charge with electrons embedded in it
Rutherford Gold Foil Experiment- Discovered the nucleus- Aimed a beam of positively charged particles at a sheet of gold foil
Bohr Described electrons as having only certain amounts of energy and moving in orbits around the nucleus- like the planets and the sun
Isotopes Atoms with the same number of protons and a different number of neutrons
Created by: FoodFan