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chemistry
Chapter 3- Atoms
| Term | Definition |
|---|---|
| Atamos | A greek philosopher named Democritus came up withe the idea that you could divide matter in half a finite number of times |
| Law of Conservation of Matter | Lavoisier, Matter cant be destroyed nor created only transferred |
| Law of Definite Proportions | Proust. A given compound is always made of the same ingredient elects in a set proportion |
| Law of Multiple Proportions | Dalton. Two elements may form more than one compound, but they will be indistinct whole number combinations |
| Atomic theory of Matter | Dalton. Combination of all the laws and made a unified scientific theory called... |
| Cathode Ray tube | used by Thompson and created a model using it |
| Plum Pudding Model | Thompson. Described model as the atom as a mass of positive charge in a matrix with negatively charged electrons scattered. |
| Gold Foil Experiment | Rutherford. Thin foil of gold mounted so he could pass a beam of alpha particles through the foil and detect radiation on photographic film around the whole setup. He expected the beam of positive particles to go straight through the foil and make a spot. |
| Explained Result | Rutherford. Saying that the atom appeared to be mainly empty space. However sometimes the positive beam came close to a dense positive area. which caused the beam to deflect. |
| Nucleus | where most of the mass and positive charge in the atom was concentrated |
| Proton | positive charge that the particle was named |
| Solar System/ Nuclear Model | Rutherford. Where a dense positive center was orbited by moving electrons |
| Neutrons | particles found in the nucleus with no control |
| Electrostatic | opposite charges create an attraction that holds the atom together |
| Strong Nuclear force | The neutrons act as a bugger zone between the protons in the nucleus reducing the repulsion between them |
| Atomic number | number of protons |
| Atomic Mass | the mass of the atom in atomic mass. Protons and neutrons are large, and both assigned 1 amu |
| Isotopes | different versions of the same atom, change in the number of neutrons |
| Ion | something that gains or loses a charge |
| Wavelength | the distance between consecutive crests of a wave |
| Frequency | number of times a crest passes a fixed point in space in a set amount of time |
| Bohr | Asked the question why did the electrons not crash into the nucleus? |
| Bohr Theory | electrons didn't orbit the nucleus. they were residing in very specific and organized energy levels |
Created by:
madigray
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