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unit 4:atomic theory

Terms in this set (9)

rutherford
conducted the gold foil experiment;described the atom as mostly empty space with a dense,positive nucleus in the center
chadwick
discovered the neutron
aristotle
stated that matter is made of five elements
bohr
proposed that electrons orbit the nucleus in circular energy levels like planets orbiting the sun
schrodinger
showed that electrons have properties of both waves and particles;showed that there are regions in the atom called orbitals where there is high probability of finding electrons
thomson
described the atom as a positively charged sphere with negative particles scattered throughout randomly;discovered electrons
democritus
stated that matter is made up of indivisible,indestructible fundamental particles called atoms
dalton
published the first atomic theory
heisenberg
stated that the precise location of electrons cannot be known
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