Next step of the neptunium-237 decay series, very unstable francium-221 is produced. The half-life of francium-221 is only 5.00 minutes, if the initial mass of francium-221 in a sample is 6.12 grams, how much francium-221 (in grams) will remain after 6.42 minutes?

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.