The nuclear equation for the most likely mode of decay for each of the given unstable nuclide is to be written. Concept Introduction: Type of radioactivity can be explained by nuclear stability after the decay, which is determined by the ratio of neutrons to protons. The N Z ratio for a stable nucleus with an atomic number around 40 is 1.25 and for a stable nucleus with an atomic number above 83 is 1.5, where N is the number of neutrons and Z is the atomic number. There are two possibilities: When N Z is too high, the nucleus tends to have beta decay as there are more neutrons than protons and they tend to convert to protons. However, when N Z is too low, the nucleus tends to undergo positron emission or electron capture as there are more number of protons and they tend to convert to neutrons.

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Chapter 20, Problem 79E

Interpretation Introduction

Interpretation: The nuclear equation for the most likely mode of decay for each of the given unstable nuclide is to be written.

Concept Introduction: Type of radioactivity can be explained by nuclear stability after the decay, which is determined by the ratio of neutrons to protons. The NZ ratio for a stable nucleus with an atomic number around 40 is 1.25 and for a stable nucleus with an atomic number above 83 is 1.5, where N is the number of neutrons and Z is the atomic number.

There are two possibilities:

When NZ is too high, the nucleus tends to have beta decay as there are more neutrons than protons and they tend to convert to protons.

However, when NZ is too low, the nucleus tends to undergo positron emission or electron capture as there are more number of protons and they tend to convert to neutrons.

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