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first person to investigate the atom
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"Cutting the Cheese" cut pieces till atom is left
first atomic theory
Came up with "atom" term -
Didn't believe in atomic theory
Believed in 4 elements, Fire, Earth, Water, and Air. -
"Matter is made up of atoms"
Held together by forces -
- All matter is made of atoms
- all atoms of an element are alike but different than other elements 3.compunds formed when different elements atoms combine
- chemical reactions cause atoms to rearrange not change
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discovered radio activity
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discovered electron
Cathode Ray Experiment
developed Plum Pudding Model -
individual electrons
oil drip experiment -
Bohr model
Electrons paths followed -
nuclear atoms
atom is mostly negative space
Gold Foil Experiment conducted -
fired particles through foil sheet. Noticed particles veared off track. Nucleus caused this effect because of its mass.
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invented mass spectograph
used Bohr's Model
discovered isotopes -
used math equations to find the most likely locations to find an electron in an atom
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discovered neutron
Atomic Planetary Model