Textbook Question
The accompanying graph illustrates the decay of 8842Mo, which decays via positron emission. (a) What is the halflife of the decay? [Section 21.4]
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Ch.21 - Nuclear Chemistry
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement140
- Ch.2 - Atoms, Molecules, and Ions192
- Ch.3 - Chemical Reactions and Reaction Stoichiometry172
- Ch.4 - Reactions in Aqueous Solution156
- Ch.5 - Thermochemistry151
- Ch.6 - Electronic Structure of Atoms137
- Ch.7 - Periodic Properties of the Elements127
- Ch.8 - Basic Concepts of Chemical Bonding143
- Ch.9 - Molecular Geometry and Bonding Theories167
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces97
- Ch.12 - Solids and Modern Materials129
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics175
- Ch.15 - Chemical Equilibrium107
- Ch.16 - Acid-Base Equilibria127
- Ch.17 - Additional Aspects of Aqueous Equilibria133
- Ch.18 - Chemistry of the Environment88
- Ch.19 - Chemical Thermodynamics140
- Ch.20 - Electrochemistry137
- Ch.21 - Nuclear Chemistry99
- Ch.22 - Chemistry of the Nonmetals66
- Ch.23 - Transition Metals and Coordination Chemistry69
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry11
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 21, Problem 7b
All the stable isotopes of boron, carbon, nitrogen, oxygen, and fluorine are shown in the accompanying chart (in red), along with their radioactive isotopes with t1>2 7 1 min (in blue). (b) Which radioactive isotopes are most likely to decay by beta emission? [Sections 21.2, 21.4, and 21.5]
Verified step by step guidance1
Identify the radioactive isotopes from the chart (highlighted in yellow).
Recall that beta emission occurs when a neutron is converted into a proton, emitting a beta particle (electron) and an antineutrino.
Determine which isotopes have a neutron-to-proton ratio that is higher than the stable isotopes, as these are more likely to undergo beta emission to achieve stability.
Compare the neutron-to-proton ratios of the radioactive isotopes with those of the stable isotopes.
Select the radioactive isotopes with higher neutron-to-proton ratios as the ones most likely to decay by beta emission.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Isotopes
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This difference in neutron count results in varying atomic masses. Stable isotopes do not undergo radioactive decay, while unstable isotopes are radioactive and can decay into other elements or isotopes over time.
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04:36
Isotopes
Beta Emission
Beta emission is a type of radioactive decay in which a beta particle (an electron or positron) is emitted from an atomic nucleus. This process occurs when a neutron is transformed into a proton, increasing the atomic number of the element while keeping the mass number constant. It is a common decay mode for isotopes that are neutron-rich.
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03:01Beta Decay
Half-Life
Half-life is the time required for half of the radioactive nuclei in a sample to decay. It is a crucial concept in understanding the stability and decay rates of isotopes. The half-lives of isotopes can vary widely, from fractions of a second to thousands of years, influencing their applications in fields such as medicine and archaeology.
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Related Practice
Textbook Question
Indicate the number of protons and neutrons in the following nuclei: (c) neptunium-237.
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Textbook Question
Indicate the number of protons and neutrons in the following nuclei: (b) 193Tl.
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Textbook Question
The accompanying graph illustrates the decay of 8842Mo, which decays via positron emission. (c) What fraction of the original sample of 8842Mo remains after 12 min? [Section 21.4]
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