need help Half-lifeof parent(years)IsotopeParentDaughterUseful range(уears)Nitrogen 145,730100 - 30,000Carbon 14100,000 -4.5 billionPotassium 40 Argon 401.3 billion10 million -4.5 billionRubidium 87 Strontium 8747 billionUranium 238 Lead 206Uranium 2354.5 billion710 million10 million-4.6 billionLead 2071. If a sample contains 100 g of a radioactive isotope, how much will be left after 3 half lives?2. If a sample contains 50g of a radioactive isotope, how much will be left after 2 half lives?3. If a sample contains 20g of an isotope that has a half life of 1000 years. How much will be left after 2000years?4. If a sample has only 20 g remaining after 3 half lives, how much was there to start with?5. If you start with 1000 g of Carbon 14, how much will remain after 4 half lives? 5. If you start with 1000 g of Carbon 14, how much will remain after 4 half lives?6. Assume you start with 10,000 Carbon 14 atoms. How many will remain after:2 half lives?1 half life?3 half lives?.7. What is the half life of Potassium 40?,8. If a fossil originally contained 100,000 Potassium 40 atoms and it now contains only 12,500, how old is thefossil?Use the following diagram to answer # 9-11:O minutes10 minutes20 minutes30 minutes9. What is the half life of the element in the picture?

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1. If a sample contains 100 g of a radioactive isotope, how much will be left after 3 half lives? 2. If a sample contains 50g of a radioactive isotope, how much will be left after 2 half lives? 3. If a sample contains 20g of an isotope that has a half life of 1000 years. How much will be left after 2000years?