What particle is produced during the following decay processes: (a) sodium-24 decays to magnesium-24, (b) mercury-188 decays to gold-188, (d) plutonium-242 decays to uranium-238?

Name: Chemistry: The Central Science
Author: Brown
ISBN: 9780134414232

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Identify the type of decay process for each reaction. For (a) sodium-24 to magnesium-24, check if the atomic number decreases by 1, indicating beta-plus decay (positron emission).

For (a), write the nuclear equation: \( \text{^{24}_{11}Na} \rightarrow \text{^{24}_{12}Mg} + \text{^{0}_{+1}e} \). The particle produced is a positron \( \text{^{0}_{+1}e} \).

For (b) mercury-188 to gold-188, check if the atomic number decreases by 1, indicating beta-plus decay (positron emission).

For (b), write the nuclear equation: \( \text{^{188}_{80}Hg} \rightarrow \text{^{188}_{79}Au} + \text{^{0}_{+1}e} \). The particle produced is a positron \( \text{^{0}_{+1}e} \).

For (d) plutonium-242 to uranium-238, check if the mass number decreases by 4 and the atomic number decreases by 2, indicating alpha decay. Write the nuclear equation: \( \text{^{242}_{94}Pu} \rightarrow \text{^{238}_{92}U} + \text{^{4}_{2}He} \). The particle produced is an alpha particle \( \text{^{4}_{2}He} \).

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Nuclear Decay

Nuclear decay is a 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. Understanding the type of decay is crucial for predicting the particles produced and the resulting elements.

Alpha and Beta Particles

Alpha particles consist of two protons and two neutrons, essentially a helium nucleus, and are emitted during alpha decay. Beta particles are high-energy, high-speed electrons or positrons emitted during beta decay. Identifying whether a decay process involves alpha or beta emission helps determine the resulting element and its atomic structure.

Mass Number and Atomic Number

The mass number is the total number of protons and neutrons in an atomic nucleus, while the atomic number is the number of protons. During decay processes, these numbers change, leading to the formation of new elements. Understanding how these numbers shift during decay is essential for predicting the products of nuclear reactions.