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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 |
Created by:
carolineeasley
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