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chapter 4 (atom scientist (robert millikan (discovered atoms, oil drop),…
chapter 4
atom scientist
democritus, observed different things
john dalton
discovered the atom theory
J.J. Thompson discovered the electron
robert millikan
discovered atoms
oil drop
earnest rufford
gold foil experiment
james chadwick
prove that the neuron existed
atomic mass
positive ion
negative
proton
element
atom
proton is positive charge
neutrons
protons
electrons
isotopes
mass of an isotope
atomic mass of an object
calculate the atomic mass of an object
two isotopes have the same number of protons