Determine whether or not each nuclide is likely to be stable. State your reasons. a. Mg-26 b. Ne-25 c. Co-51
Ch.20 - Radioactivity and Nuclear Chemistry
Chapter 20, Problem 32a,b
Write a nuclear equation for the indicated decay of each nuclide. a. Po-210 (alpha) b. Ac-227 (beta)
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nuclear Decay
Nuclear decay is the process by which an unstable atomic nucleus loses energy by emitting radiation. This can occur in various forms, including alpha decay, beta decay, and gamma decay. Each type of decay results in the transformation of the original nuclide into a different nuclide, often accompanied by the release of particles or electromagnetic radiation.
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Alpha Decay
Beta Decay
Beta decay is a specific type of nuclear decay where a neutron in the nucleus is transformed into a proton, resulting in the emission of a beta particle (an electron or positron). This process increases the atomic number of the nuclide by one while keeping the mass number unchanged, leading to the formation of a new element. For example, in the case of Ac-227 undergoing beta decay, it transforms into a different element with an atomic number one higher.
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Beta Decay
Nuclear Equation
A nuclear equation represents the transformation of one nuclide into another during a nuclear reaction, showing the initial and final states of the nucleus along with any emitted particles. It is typically written in the form of a balanced equation, where the sum of atomic numbers and mass numbers on both sides must be equal. For beta decay, the equation will include the original nuclide, the emitted beta particle, and the resulting nuclide.
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Related Practice
Textbook Question
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Textbook Question
Which nuclide in each pair would you expect to have the longer half-life? a. Cs-149 or Cs-139 b. Fe-45 or Fe-52
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Textbook Question
Write the nuclear equation for the most likely mode of decay for each unstable nuclide. a. Ru-114 c. Zn-58 d. Ne-31
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Open Question
Complete each nuclear equation and calculate the energy change (in J/mol of reactant) associated with each (Al-27 = 26.981538 amu, Am-241 = 241.056822 amu, He-4 = 4.002603 amu, Np-237 = 237.048166 amu, P-30 = 29.981801 amu, S-32 = 31.972071 amu, and Si-29 = 28.976495 amu).
b. 3216S + ______ → 2914Si + 42He
c. 24195Am → 23793Np + _____
Open Question
Why do neon and magnesium each have three stable isotopes while sodium and aluminum each have only one?
Open Question
A sample of Tl-201 has an initial decay rate of 5.88⨉104/s. How long will it take for the decay rate to fall to 287/s? (Tl-201 has a half-life of 3.042 days.)