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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Identify the nuclides in the pair: Cs-149 and Cs-139.

Understand that the half-life of a nuclide is influenced by its nuclear stability.

Consider the neutron-to-proton ratio for each nuclide, as a more balanced ratio often indicates greater stability.

Research or recall the known half-lives of these isotopes if available, as empirical data can provide direct insight.

Conclude which nuclide is more stable and thus likely to have a longer half-life based on the above analysis.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Half-Life

Half-life is the time required for half of the radioactive nuclei in a sample to decay. It is a key concept in nuclear chemistry and helps in understanding the stability of isotopes. A longer half-life indicates a more stable nuclide, as it decays more slowly compared to those with shorter half-lives.

Radioactive Decay

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation. This can occur in various forms, including alpha, beta, and gamma decay. The type of decay and the energy released can influence the half-life of a nuclide, affecting its stability and longevity.

Nuclear Stability

Nuclear stability refers to the tendency of a nucleus to remain intact without undergoing radioactive decay. Factors influencing stability include the ratio of neutrons to protons and the overall binding energy of the nucleus. Generally, isotopes with a balanced neutron-to-proton ratio are more stable and exhibit longer half-lives.