SOME ISOTOPES USED FOR RADIOMETRIC DATINGDaughterIsotope (D)Half-Lives (T½)Useful Dating RangeParentIsotope (P)Materials DatedNewly formedcrystalUranium-2384.5 billion years Zircon713 million years ZirconLead-206ages > 10 m.y.100Uranium-235Lead-207ages > 10 m.y.0000000oo0000015.9%decayed todaughterPotassium-40 Argon-40Biotite, muscovite,whole volcanic rock1.3 billion yearsages > 50,000 yrShells, limestone,organic materialsages 100-60,000 yrCarbon-14Nitrogen-145730 years84.129.3%decayed70.7ParentAtoms (P)000000000e50%decayedRADIOACTIVEDECAY50.0DaughterAtoms (D)25.075% decayed87.5%decayed12.593.8%decayed96.9%decayed6.23.11423456Half-Lives (T1) ElapsedDECAY PARAMETERS FOR ALL RADIOACTIVE DECAY PAIRSPercent ofParentAtoms (P)Percent ofDaughterAtoms (D)Half-LivesElapsedAge0.000 x T0.015 x T0.031 x Ty0.062 x Ty0.125 x T0.250 x T0.500 x T21.000 x Ty2100.00.098.91.11/6497.92.11/3295.84.21/1691.78.31/884.115.91/470.729.31/250.050.011'½1.500 x T,2.000 x T3.000 x T4.000 x Ty5.000 x Ty235.464.625.075.0212.587.536.293.843.196.9Percent of Parent (P) Atoms Remaining A. A solidified lava flow containing zircon mineral crystals is present in a sequence of rock layers that are exposed in ahillside. A mass spectrometer analysis was used to count the atoms of uranium-235 and lead-207 isotopes in zircon samplesfrom the lava flow. The analysis revealed that 71% of the atoms were uranium-235, and 29% of the atoms were lead-207.Refer to Figure 8.10 to help you answer the following questions.1. About how many half-lives of the uranium-235 tolead-207 decay pair have elapsed in the zircon crystals?2. What is the absolute age of the lava flow based on its zircon crystals? Show your calculations.3. What is the age of therock layers beneath the lava flow?4. What is the age of therock layers above the lava flow?

The above question can be answered on the based of the table given above:

A. A solidified lava flow containing zircon mineral crystals is present in a sequence of rock layers that are exposed in a hillside. A mass spectrometer analysis was used to count the atoms of uranium-235 and lead-207 isotopes in zircon samples from the lava flow. The analysis revealed that 71% of the atoms were uranium-235, and 29% of the atoms were lead-207. Refer to Figure 8.10 to help you answer the following questions. 1. About how many half-lives of the uranium-235 to lead-207 decay pair have elapsed in the zircon crystals?. 2. What is the absolute age of the lava flow based on its zircon crystals? Show your calculations. 3. What is the age of the rock layers beneath the lava flow? 4. What is the age of the rock layers above the lava flow?

A. A solidified lava flow containing zircon mineral crystals is present in a sequence of rock layers that are exposed in a hillside. A mass spectrometer analysis was used to count the atoms of uranium-235 and lead-207 isotopes in zircon samples from the lava flow. The analysis revealed that 71% of the atoms were uranium-235, and 29% of the atoms were lead-207. Refer to Figure 8.10 to help you answer the following questions. 1. About how many half-lives of the uranium-235 to lead-207 decay pair have elapsed in the zircon crystals?. 2. What is the absolute age of the lava flow based on its zircon crystals? Show your calculations. 3. What is the age of the rock layers beneath the lava flow? 4. What is the age of the rock layers above the lava flow?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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