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​What Percent of a Present Amount of Radioactive Radium

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​What percent of a present amount of radioactive radium ​What percent of a present amount of radioactive radium   will remain after 900 years? The half-life of radium is 1,600 years. ​ A)  ​45% B)  ​25% C)  ​65% D)  ​68% will remain after 900 years? The half-life of radium is 1,600 years. ​


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