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orig&mod.atomic theo
original atomic theory and modern atomic theory
| Question | Answer |
|---|---|
| what is another name for dalton's theory of atoms | original atomic theory |
| what does dalton's theory of atoms state? | 1.) elements are composed of indivisible atoms2.) atoms of the same element are identical3.) chemical reactions are the result of the union of atoms OR the disunion of molecules |
| what are ions? | charged species formed when an atom gains or loses electrons |
| what are metal ions? | positively charged species formed when a METAL atom LOSES one of more electrons |
| what are two different types of metal ions? | magneisum (Mg) and Iron (Fe) |
| how do you find the protons, electrons, and neutrons for these metal ions? | protons=atomic masselectrons= subtract charge from atomic numberneutrons= ? |
| what did thomson contribute to the modern atomic theory? | *refines and uses the cathode tube*determined that there are "particles" inside atoms with mass & a negative charge*determined the mass to charge ratio for these "particles" (later called electrons by millikan) |
| what did millikan contribute to the modern atomic theory? | *named the negative particles= electrons*determined the specific mass & charge of electrons |
| what did rutherford (with geiger and marsden) contribute to the modern atomic theory? | did the experiment using the gold foil , where most particles passed through the gold foil, but some particles bounced off. determined that in the center of the gold atoms is a dense, compact nucleus containing protons and something else (turns out to be |
| what did chadwick contribute to the modern atomic theory? | verified the existance of neutrons |
| what did roentgen contribute to the modern atomic theory? | develops and uses the x-ray tube |
| what did the curies contribute to the modern atomic theory? | they separate the ore into 2 radioactive isotopes: polonium and radium |
| what are the 3 official parts of the modern atomic theory? | 1.) elements are composed of atoms with protons, electrons, and neutrons2.) atoms of the same element have the same number of protons and similar characteristics3.) chemical reactions are the result of the union of elements or the disunion of molecules |
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iceicebaybee413
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