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The half-life of actinium-228 is 6.13 hours. What amount of a 7.0 milligram sample remains after 24.52 hours?
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Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.
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In what environment would mineral formation caused by high pressures and high temperatures most likely occur?
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The half-life of actinium-228 is 6.13 hours. What amount of a 7.0 milligram sample remains after 24....
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