# Write a balanced nuclear equation for the alpha decay of radon 222

For example: the half-life of is 1. Radium is the reactant; radon, an alpha particle, and a gamma ray are the products.

## Write the balanced nuclear equation for the formation of polonium ? 215 through ? decay

PET scans are now usually performed in conjunction with a computed tomography scan. The neptunium series, previously thought to terminate with bismuth, terminates with thallium Since first-order reactions have already been covered in detail in the kinetics chapter, we will now apply those concepts to nuclear decay reactions. In a given cobalt source, since half of the nuclei decay every 5. Positron decay is the conversion of a proton into a neutron with the emission of a positron. Electron capture has the same effect on the nucleus as does positron emission: The atomic number is decreased by one and the mass number does not change. Substituting this into the equation for time for first-order kinetics, we have: Check Your Learning Radon, , has a half-life of 3.

This table summarizes the type, nuclear equation, representation, and any changes in the mass or atomic numbers for various types of decay.

The half-lives of a number of radioactive isotopes important to medicine are shown in Table 2and others are listed in Appendix M.

## How to solve nuclear equations

Positron decay is the conversion of a proton into a neutron with the emission of a positron. The neptunium series is a fourth series, which is no longer significant on the earth because of the short half-lives of the species involved. Equations for Nuclear Reactions Radioactivity is the decay or disintegration of the nucleus of an atom. Figure 3 summarizes these types of decay, along with their equations and changes in atomic and mass numbers. The 18F emits positrons that interact with nearby electrons, producing a burst of gamma radiation. Figure 5. Three of these series include most of the naturally radioactive elements of the periodic table. Like a chemical equation, a nuclear equation must be balanced. Such nuclei lie above the band of stability. Energy, in the form of gamma rays, may also be released by this process, and a different atom is formed. This table summarizes the type, nuclear equation, representation, and any changes in the mass or atomic numbers for various types of decay. Characteristics of Nuclear Reactions A.

Gamma rays, which are unaffected by the electric field, must be uncharged. Three of these series include most of the naturally radioactive elements of the periodic table.

During the beginning of the twentieth century, many radioactive substances were discovered, the properties of radiation were investigated and quantified, and a solid understanding of radiation and nuclear decay was developed.

The changes caused by the emission of the three types of radiation are summarized in Table 4. First, the total mass of the products must equal the total mass of the reactants.

Although the radioactive decay of a nucleus is too small to see with the naked eye, we can indirectly view radioactive decay in an environment called a cloud chamber.

### Nuclear equation calculator

Click here to learn about cloud chambers and to view an interesting Cloud Chamber Demonstration from the Jefferson Lab. Beta particles, which are attracted to the positive plate and deflected a relatively large amount, must be negatively charged and relatively light. All of these characteristics and more can be shown by using an equation to describe the radioactive process. For example, cobalt, an isotope that emits gamma rays used to treat cancer, has a half-life of 5. During the process, either alpha or beta particles may be emitted. Characteristics of Nuclear Reactions A. The charge on each of these particles is its atomic number.

Thus, a cobalt source that is used for cancer treatment must be replaced regularly to continue to be effective. Note that for a given substance, the intensity of radiation that it produces is directly proportional to the rate of decay of the substance and the amount of the substance. Each series is characterized by a parent first member that has a long half-life and a series of daughter nuclides that ultimately lead to a stable end-product—that is, a nuclide on the band of stability Figure 5. Emission of a gamma ray changes neither the mass nor the charge of the nucleus.

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