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PLZZZZ HELP 99 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 clo
PLZZZZ HELP 99 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!
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?
1. The rock reached its closure temperature 6,400 years ago.
2. The rock reached its closure temperature 4,800 years ago.
3. The rock had 2.625 grams of radon-222 1,600 years ago.
4. When the rock was discovered, it had 5.625 grams of radon-222.
4. When the rock was discovered, it had 3.375 grams of radon-222.
