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Chemistry, 23.09.2019 18:00 alexapacheco012

Aradioactive isotope of radium (ra-226) has a half life of 1620 years. how much of this isotope remains after three (3) half-lives
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Aradioactive isotope of radium (ra-226) has a half life of 1620 years. how much of this isotope rema...
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