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Chem Test - atomic
beginning of atomic theory
| Question | Answer |
|---|---|
| Moseley | discovered that all atoms of an element have the same number of protons |
| In a single neutral atom the number of protons equals the number of | electrons |
| Ion | an atom that has lost or gained electrons |
| The average mass of an element's atoms | atomic mass |
| 1 AMU equals | 1 / 12 the mass of a carbon-12 atom |
| isotopes | atoms with the same number of protons but a different number of neutrons |
| How do you calculate the charge of an atom? | protons minus electrons |
| What lead to idea that cathode rays had neg charged particles? | the magnet.. |
| Thomson | figured out the charge to mass ratio |
| Miliken | found the charge of a single electron |
| Becquerel | figured out natural radioactivity with the crystals. used radium and pulonium in experiments |
| Thomoson's Model | grapes in jello, positively charged with negative charge in it, did not know how they arranged |
| Rutherford | developed nuclear model of atom |
| rutherford 2 | gold foil --> nucleus |
| Types of radiation | alpha, gamma, beta |
| alpha | positive (4amu) |
| beta | negative (1amu) electron |
| gamma | radiation |
| Michael Faraday | suggested structure of atom somehow related to electricity |
| Cathode | negative |
| Anode | positive |
| Henri Becquerel discovered radioactivity while working with | uranium |
| charge of a nucleus | positive |
| static electricity | electric charges that are not in motion |
| cathode ray | stream of particles orginating from a cathode |
| coulomb | SI unit of electrical charge = 1 electron |
| radioactivity | spontaneous emission of radiation from an element |
| gamma radiation | radiation similar to xrays that is not composed of particles |
| alpha particle | particle with +2 charge emitted by radioactive elements |
| oil drop | done by miliken, measures the charge of a single electron |
| law of multiple proportions | (blank) |
Created by:
07adelmanl
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