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16 Cards in this Set
- Front
- Back
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Atomic Nucleus |
Protons and Neutrons packed into a dense core at the center of an atom |
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Atomic Number |
Number of protons in an atom |
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Mass number |
Sum of protons plus neutrons in the nucleus of an atom |
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Atomic mass |
Total mass of an atom. Usually mesured daltons. |
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Radioactive isotope |
Nucleus decays spontaneously, giving off particles and energy. When decay leads to loss of a number of protons, the element changes. |
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Half-life |
Time is takes 50% of the parent isotope to decay |
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Radiometric dating |
Measure the ratio of different isotopes and calculate hie many half-lives have passed since formation. |
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Energy |
Capacity to cause a change by doing work |
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Potential energy |
Energy matter pocesses because of location or structure. |
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When an electron loses energy, it... |
..."falls back" to an electron shell closer to the nucleus. |
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Valence electrons |
Electrons in the outer most shell |
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Valence shell |
Outer most electron shell |
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Orbital |
Three dimensional space where an electron is found 90% of the time. |
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Electron distribution diagram |
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Seperate electron orbitals |
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Superimposed electron orbitals |
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