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discovered nucleus had positive charge- protons. did gold foil experiment

William Thomson

first to state that electrons are building blocks of atoms

J.J. Thomson

discovered isotopes and electrons. plum pudding model


bombarded atoms w/ alpha particles, and noticed beam of radiation. The beam had no charge, and the molecules had mass


interpreted Curie's idea and called them neutrons


model later proved wrong by Heisenberg. planetary model- said that electrons move around the nucleus in energy levels and its called the planetary model because the e- orbit the nucleus like the planets orbit the sun


uncertainty principle- you can pinpoint speed or location of electrons but not both at the same time


quantum theory- e=hv. figured out that electron magnetic energy is quantized for a given frequency of radiation (or light)


accurately discovered charge of an electron

Hund's rule

each orbital in a sub level is filled singlely before it doubles

Schrodinger & Broglie

wave/mechanical model and discovered orbitals


discovered atomic theory: elements made of atoms, compounds 2+ different atoms, atoms cant be destroyed, same atoms are same.

plum pudding model

the model of the atom created by JJ Thomson, consists of electrons on the surface of a positively charged sphere

gold foil experiment

Rutherford's experiment involving shooting alpha particles at gold foil and observing them going through and bouncing off determining that the nucleus of an atom has a positive charge

wave mechanical model

path of electron in hydrogen atom cannot be determined precisely but probably, like fireflies flying around a room

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