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14 Cards in this Set
- Front
- Back
Isotopes |
Different # of neutrons, same # of protons in an element. -Most elements have isotopes; very common - Isotopes decay at different rates |
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# of Neutrons |
Mass # - Atomic # = # of neutrons |
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Radioactive Decay |
Unstable nucleus releases particles & energy & changes into new element. - If # of protons change during radioactive decay, a new element is produced - Only some elements are unstable Uses: - Medical imagery -stopping cancer cells -killing bacteria -producing energy |
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Radioactive |
an atom that undergoes radioactive decay |
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Radioactive Elements |
Elements only having radioactive isotopes |
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Half -life |
Time it takes for a sample of Radioactive isotope to decay to half it's original mass -Useful for dating rocks/fossils |
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Synthetic Elements |
(not found in nature) : made in a lab by crashing particles together in a particle accelerator |
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Physical Property |
-Observed characteristics -Does not change the identity of substance |
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Chemical Property |
-Ability or inability of a substance to combine and change into 1 or more substance(s) |
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Chemical Change |
-Is a change of 1 or more substances into another substance(s) |
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Molecule |
a neutral particle that forms as a result of electron sharing -2 or more atoms combined -can be just one element or more than one element combined |
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Decomposition |
when a compound "decomposes" into it's elements |
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Compound |
contains more then one element |
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Synthesis |
when a element combine to form compounds |