Answer:
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A physical property is a quality or condition of a substance that can be observed or measured without changing the substance's composition. a chemical property is the ability of a substance to undergo a specific chemical change.
They all look like there decaying and was left out or sat inside too long
Answer:
If we start with 20 atoms of plutonium – 239, how many would remain after 48,240 years?
Explanation:
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