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4 Cards in this Set
- Front
- Back
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Dalton |
Different solid sphere made up different elements |
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JJ Thompson |
Atom contains electrons Plum pudding model |
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Rutherford’s model |
Gold foil experiment - shot + alpha particles at a thin gold foil-expected particles to be deflected Most particles passed straight through Small no deflected back Positively charged nucleus-surrounded by a cloud of ‘-‘ electrons |
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Bohr |
Electrons exist in fixed orbits Each shell has fixed energy =fixed frequency When an element moves between shells electromagnetic radiation is emitted or absorbed |
