Asample of a radioactive element has a mass of 80 g. how much parent and daughter materials are in the sample after two half-lives?

20 g parent 60 g daughter

Explanation:

im a teacher

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emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.