Solved: The heaviest member of the alkaline earth metals

Chapter , Problem 78

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The heaviest member of the alkaline earth metals is radium (Ra), a naturally radioactive element discovered by Pierre and Marie Curie in 1898. Radium was initially isolated from the uranium ore pitchblende, in which it is present as approximately 1.0 g per 7.0 metric tons of pitchblende. How many atoms of radium can be isolated from g of pitchblende (1 metric ton _ 1000 kg)? One of the early uses of radium was as an additive to paint so that watch dials coated with this paint would glow in the dark. The longest-lived isotope of radium has a half-life of years. If an antique watch, manufactured in 1925, contains 15.0 mg of radium, how many atoms of radium will remain in 2025?

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