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Atomic Stucture
unit 3
Question | Answer |
---|---|
atom | smallest particle of element that retains it's identity |
Democritus | - came up with idea of atom - believed atoms were indivisible and indestructable (WRONG) |
Dalton's Atomic Theory | -- all elements made from atoms -- same element= same atom -- atoms combine in whole number ratios -- atoms can be rearranged but not changed into another atom |
electron | negative charge |
who discovered electron and what did they call them | JJ Thomson; corpuscles |
JJ Thomson discovered... | charge to mass ratio |
who did the Cathode Ray experiment | JJ Thomson |
Millikan found | electrons charge which led to finding the mass |
who did the oil drop experiemnt | Millikan |
4 things Thomson did | -- discovered electron -- cathode ray experiment -- charge:mass ratio -- Plum Pudding Model |
proton | positive charge |
neutron | neutral charge |
proton (in chart) | symbol: p^+ mass (amu): 1 charge: 1+ |
neutron (in chart) | symbol: n^0 mass (amu): 1 charge: 0 |
electron (in chart) | symbol: e^- mass (amu): 0 charge: 1- |
Gold-foil experiment | rutherford; shot alpha particles @ gold foil and particles went straight through; some were deflected at large angles |
electrons are ____ of nucleus | outside |
atomic number | number of protons |
proton #= | electron # |
nucleus contains most of | mass |
round atomic | mass |
neutron number= | mass #- atomic number |
diff element= | diff number of protons |
ion | same # of protons; diff number of electrons |
isotope | same# of protons; diff number of neutrons |