# Write an equation for the decay of potassium 40 to argon 40

So it's negative natural log of 2 divided by 1. 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.

From potassium 40 to argon 40 The electron capture which causes potassium 40 to transform into argon 40 in its ground state takes place in only 0. So this would have 22 neutrons.

As a result it has one bachelor proton and one bachelor neutron.

What actually matters is the ratio. Example 1 applies these calculations to find the rates of radioactive decay for specific nuclides.

## Potassium-40 uses

So it won't necessarily seep out. We classify different types of radioactive decay by the radiation produced. As the outer electron drops into the vacancy, it will emit energy. They are the uranium series, the actinide series, and the thorium series. It's a bunch of stuff right over here. Access to page in french Learn more :. So how can we use this information-- in what we just figured out here, which is derived from the half-life-- to figure out how old this sample right over here? This isotope makes up one ten thousandth of the potassium found naturally. So k is this thing right over here. Beta particles, which are attracted to the positive plate and deflected a relatively large amount, must be negatively charged and relatively light. It's a pretty good indicator, if you can assume that this soil hasn't been dug around and mixed, that this fossil is between million and million years old. It has 18 protons. So, when a mineral forms — whether from molten rock , or from substances dissolved in water — it will be initially argon-free, even if there is some argon in the liquid.

And this isn't the exact number, but it'll get the general idea. For example: the half-life of is 1. Far more frequently Now, we also know that not all of the atoms of a given element have the same number of neutrons.

The radiation produced during radioactive decay is such that the daughter nuclide lies closer to the band of stability than the parent nuclide, so the location of a nuclide relative to the band of stability can serve as a guide to the kind of decay it will undergo Figure 1.

It looks like it's been pretty untouched when you look at these soil samples right over here. So for example, potassium can come in a form that has exactly 20 neutrons. This isotope makes up one ten thousandth of the potassium found naturally.

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