Question

You have 80 g of a radioisotope. If the half-life of this radioisotope is 4 days, how many grams will remain after 16 days? Must show work or reasoning for full credit

Answer 1

0 half lives - 80g
1 half life (4 days) - 40 g
2 half lives (8 days) - 20 g
3 half lives (12 days) - 10 g
4 half lives (16 days) - 5 g