The isotope radium-226 decays into radon-222, with a half-life of around 1,600 years. if a rock contained 6 grams of radium-226 when it reached its closure temperature but only 0.375 grams when it was discovered, which two statements about the rock are true? a] the rock reached its closure temperature 6,400 years ago. b] the rock reached its closure temperature 4,800 years ago. c]the rock had 2.625 grams of radon-222 1,600 years ago. d]when the rock was discovered, it had 5.625 grams of radon-222. e]when the rock was discovered, it had 3.375 grams of radon-222.
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