Chlorine- 39 and strontium-90 both undergo loss of a beta particle to form different elements. For each of these radioactive decay processes, write the appropriate nuclear equation and show the nature of the elements that are formed.

Short Answer

Expert verified
Chlorine-39 undergoes beta decay to form Argon-39 as per the equation \( _{17}^{39}Cl \rightarrow _{18}^{39}Ar + _{-1}^0\beta^- \). Strontium-90 decays into Yttrium-90 shown by \( _{38}^{90}Sr \rightarrow _{39}^{90}Y + _{-1}^0\beta^- \).

Step by step solution

01

Write the nuclear equation for Chlorine-39

To write the nuclear equation for beta decay of Chlorine-39 into a new element, we need to know that a beta particle is the same as an electron and has the symbol \( \beta^- \) with a mass number of 0 and an atomic number of -1. Chlorine-39, with an atomic number of 17, loses a beta particle. The atomic number will increase by 1 because the neutron turns into a proton while releasing an electron (beta particle). The resulting element will have a mass number of 39 and an atomic number of 18, which is Argon (Ar). The equation is \( _{17}^{39}Cl \rightarrow _{18}^{39}Ar + _{-1}^0\beta^- \).
02

Write the nuclear equation for Strontium-90

We apply the same principle to Strontium-90, which has an atomic number of 38. During beta decay, a neutron becomes a proton and a beta particle is emitted. This increases the atomic number by 1, to 39, while the mass number remains 90. The new element formed is Yttrium (Y). The nuclear equation for this decay process is \( _{38}^{90}Sr \rightarrow _{39}^{90}Y + _{-1}^0\beta^- \).
03

Identify the new elements

From the above equations, we can identify the elements formed from the radioactive decay. Chlorine-39 turns into Argon-39 while Strontium-90 turns into Yttrium-90.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Radioactive Decay
Radioactive decay is a fundamental concept in nuclear chemistry dealing with unstable atomic nuclei releasing energy to become more stable. Atoms of radioactive elements spontaneously disintegrate over time into lighter atoms, a process accompanied by the emission of particles or electromagnetic radiation. One common type of radioactive decay is beta decay, in which a beta particle, an electron or a positron, is emitted.

As they decay, radioactive atoms transform into different elements or isotopes, reshaping the very fabric of the material. This transformation is governed by the rules of nuclear physics rather than chemical reactions. Radioactive decay follows a predictable pattern known as a half-life, the time required for half of the radioactive isotope in a sample to decay. Understanding radioactive decay is crucial for various applications, including dating archaeological finds, medical treatments such as cancer radiotherapy, and as a power source in nuclear reactors and space probes.
Nuclear Chemistry
Nuclear chemistry is the branch of chemistry that deals with nuclear reactions and their implications. It encompasses a myriad of processes, including how subatomic particles like neutrons and protons are arranged within an atom's nucleus, and how changes to this arrangement can release or absorb energy.

In the context of radioactive decay, nuclear chemistry investigates and quantifies the transmutation of elements as atomic nuclei emit or capture particles, altering their identities. The stability of a nucleus is defined by its neutron to proton ratio, and when this balance is disrupted, the nucleus becomes unstable, leading to radioactive decay.

Key Nuclear Reactions

Nuclear chemistry covers reactions such as fusion, fission, and radioactive decay. Each process involves significant energy changes, responsible for nuclear power generation and the inner workings of stars. Education in nuclear chemistry opens doors to comprehending natural phenomena and the power to harness nuclear energy for beneficial purposes.
Beta Particle Emission
Beta particle emission is one particular type of radioactive decay where a beta particle, which is essentially a high-speed electron or positron, is emitted from an atomic nucleus. This emission can be illustrated through two significant beta decay nuclear equations from isotopes Chlorine-39 and Strontium-90.

During beta decay, a neutron in the nucleus is transformed into a proton and an electron (the beta particle), with the electron being ejected from the nucleus. This transformation increases the atomic number by one while keeping the mass number the same, resulting in a new element or isotope.

Applications of Beta Decay

Beta particles can have applications in medicine, such as in radiotherapy for cancer treatment, and in scientific research, where they are used to trace mechanisms in chemical reactions and biological processes. By controlling beta particle emission, it's possible to harness its potential in various fields of science and technology.

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