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18 Cards in this Set
- Front
- Back
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Atom |
the basic unit of a chemical element. |
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Dalton |
Thought that atoms look like a sphere that was the same throughout. |
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Thomson |
atoms must have an equal amount of positive and negative charge. |
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Thomson |
Cathode-Ray Tube experiment (CRT) |
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Rutherford |
Gold Foil Experiment |
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Rutherford |
Dense, positively-charged mass in center of atoms. (nucleus) |
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Electron |
Negative charge. Located in the electron cloud. |
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Proton |
Positive charge. Located in the nucleus of an atom. |
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Neutron |
Neutral charge. Located in the nucleus of an atom. |
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Nucleus |
Located at the center of an atom. |
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Atomic Number |
Number of protons in an atom of an element. |
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Mass Number |
Sum of protons and neutrons in the nucleus of an atom. |
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Isotopes |
Atoms of the same element that have different numbers of neutrons. |
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Average Atomic Mass |
Average mass = (isotope mass x relative abundance) + ( isotope mass x relative abundance). |
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Bohr |
Electrons (e-) move with constant speed in fixed orbits around the nucleus, like planets around the Sun. |
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De Broglie |
Moving particles like electrons have wave-like properties |
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Heisenburg |
Heisenberg Uncertainty Principle- It is impossible to determine simultaneously both the location and the speed of an electron. |
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Schrödinger |
Work lead to electron cloud model and later quantum model. |
