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12 Cards in this Set
- Front
- Back
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Artistole |
Apoosed atomic theory believed in fire air earth water |
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Democritus |
Beloved everythimg is made up of atoms that they are indestructible invisible atoms differ in shape size and weight |
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Dalton |
All matter is made of atoms 2) atoms are indestructible 3)each atom of the same element is identical 4)when elements react their atoms conmbjne in simpler ratios |
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Crookes |
Studdies cathode rays developed crooks tube |
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H becquerel |
Discovered radioactivity and Pheneoem while experimenting with uranium |
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Marie curie |
Discovered radioactive elements (radium and polonium ) |
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Thomson |
Discovered electon showed cathode rays were negative |
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Ernst rutheford |
Created a new model the gold foil exp that shows nucleus is tiny and heavy Also designed exp to use alpha particles emoted by radioactive elements to see atomic structures |
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Niels bohr |
His model represents structure of an atom in orbits |
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Milkan |
Discovered mass of electron and electrical change |
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Schrodinger |
Used equations to find the exact position of an electron |
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Chadwick |
Discovered neutron knew nuclei had both protons and nuetrons |
