9. How does the number of electrons in a normal atom compare with the number of protons in its nucleus?
19. Why is more C-14 found in new bones than in ancient bones of the same mass?
20. Why would the carbon dating method be useless in dating old coins but not old pieces of adobe bricks?
37. Why are the atomic masses of many elements in the periodic table not whole numbers?
60. If a sample of radioactive material has a half-life of one week, how much of the original sample will be left at the end of the second week? The third week? The fourth week?
61. A product of nuclear power plants is the isotope cesium-137, which has a half-life of 30 years. How long will it take for this isotope to decay to one-sixteenth its original amount?
19. Why is more C-14 found in new bones than in ancient bones of the same mass?
20. Why would the carbon dating method be useless in dating old coins but not old pieces of adobe bricks?
37. Why are the atomic masses of many elements in the periodic table not whole numbers?
60. If a sample of radioactive material has a half-life of one week, how much of the original sample will be left at the end of the second week? The third week? The fourth week?
61. A product of nuclear power plants is the isotope cesium-137, which has a half-life of 30 years. How long will it take for this isotope to decay to one-sixteenth its original amount?