Marie and Pierre Curie were both winners of the Nobel Prize in physics. This prize is one of the highest any scientist can receive. Their daughter, Irene, also received a Nobel Prize in chemistry. The Curies were a remarkable family. Pierre Curie was already a famous scientist when he met Marie, who had fled from Poland. Together they discovered polonium and radium, two elements that are important in modern industry. Pierre Curie was killed in an accident, but Marie carried on scientific research until she died in 1934. What is the main idea of this paragraph? O 1. the importance of Pierre and Marie Curie's stydies 2. the importance of winning the Nobel Prize 3. the achievements of the outstanding Curie family O 4. Marie Curie's desperate escape from Poland

Iodine-131, a beta emitter, has a half-life of 8 days. A 7-gram sample of initially pure iodine-131 is stored for 32 days. How much iodine-131 remains in the sample afterward?

Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75x1010 y, undergoes ß decay and becomes 87 Sr. The geologist determines that the ratio of 87 Sr to 87Rb is 0.136. Assuming there was no 87 Sr in the rock when it was formed, determine the age of the rock. age of rock =

A scientist discovers a new isotope, exponentialitium. The scientist sets aside 150 grams of exponentialitium. After 3 years, the scientist notices there is only 135 grams of exponentialitium left.  What is the half-life of this new isotope? Round your answer to four decimal places.

Part 1: Carbon dating An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 387 g (HINT: Assume all the carbon is 12C and determine the number of atoms, 12C has a molar mass of 12 g/mol) and careful measurements show that the remaining 14C has a current decay rate of 20 decays/s. Determine the age of the bone (and presumably the jewelry). The ratio of 14C to 12C when the animal died was 1.25x10-12 & the half-life of 14C is 5730 y. Additionally, 1 mol = 6.022×1023 particles, 1 y = 365.25 days, & 1 day = 24 h. age of bone = Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75×1010 y, undergoes - decay and becomes 87Sr. The geologist determines that the ratio of 87 Sr to 87Rb is 0.033. Assuming there was no 87Sr in the rock when it was formed, determine the age of the rock. age of rock =

A radioactive sample was measured 9.1 years ago. It had an activity of 9783.8 Bq. Today, its activity is 21 Bq. What is the half-life (in years) of this substance?

The half-life of a radioactive isotope is 6.02 hours.  25.0 Grams of this isotope is needed for an experiment.  How many grams of the isotope must be ordered if 48 hours pass between the time the isotope is ordered and the start of the experiment?

A 500 g of radioactive sample has a half life of 2.5 years. How much of the initial sample will be left after 1.4 years.