A certain radioactive element has a half-life of 20 years. If you had a block with 10 g of the element in it

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A certain radioactive element has a half-life of 20 years. If you had a block with 10 g of the element in it, after how many years will there be just 2.5 g of the element in the block?
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Nov
A certain radioactive element has a half-life of 20 years. If you had a block with 10 g of the element in it, after how many years will there be just 2.5 g of the element in the block? A certain radioactive element has a half-life of 20 years. If you had a block with [...]
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