Answered: Which parent isotope is most useful for…

Which parent isotope is most useful for dating samples that are greater than 100 million years old? a potassium-40 b lead-206 c argon-40 d uranium-238

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter11: Evidence Of Evolution

Section: Chapter Questions

Problem 2CT

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If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is _______ years old. a. 15,000 b. 26,667 c. 30,000 d. 40,000
Miller and Urey created a reaction chamber that simulated conditions in Earths early atmosphere to test the hypothesis that______. a. lightning-fueled atmospheric reactions could have produced organic compounds b. meteorites contain organic compounds c. organic compounds form at hydrothermal vents d. oxygen prevents formation of organic compounds
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ______ years old. a. 15,000 b. 26,667 c. 30,000 d. 40,000
Figure 2.3 How many neutrons do carbon-12 and carbon-13 have, respectively?
Why is the reducing nature of early Earths atmosphere key to the OparinHaldane theory of the origin of molecules necessary for life?
Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po become after it emits an alpha particle?
A. The first shell corresponds to the first energy level, and it can hold up to 2 electrons. Hydrogen has one proton, so it has 1 electron and one vacancy. A helium atom has 2 protons, 2 electrons, and no vacancies. B. The second shell corresponds to the second energy level, and it can hold up to 8 electrons. Carbon has 6 electrons, so its first shell is full. Its second shell has 4 electrons and four vacancies. Oxygen has 8 electrons and two vacancies. Neon has 10 electrons and no vacancies. C. The third shell corresponds to the third energy level, and it can hold up to 8 electrons. A sodium atom has 11 electrons, so its first two shells are full; the third shell has one electron. Thus, sodium has seven vacancies. Chlorine has 17 electrons and one vacancy. Argon has 18 electrons and no vacancies. Figure It Out: Which of these models have unpaired electrons in their outer shell?
True or false? Wrinkly textures in rock that formed from ancient biofilms living in marine sediments are considered trace fossils.
An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have? a. 11 b. 12 c. 22 d. 44
A molecule into which a radioisotope has been incorporated can be used as an ____________. a. compound c. salt b. tracer d. acid
Polonium is a rare element with 33 radioisotopes. The most common one, P210o, has 84 protons and 126 neutrons. When P210o decays, it emits an alpha particle, which is a helium nucleus 2 protons and 2 neutrons. P210o decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason why authorities failed to discover toxic amounts of P210o in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of P210o change into after it emits an alpha particle.
Figure 2.3 How many neutrons do (K) potassium-39 and potassium-40 have, respectively?