Radiometric dating activity answers
Uranium-238 contains 92 protons and 146 neutrons, while uranium-235 contains 92 protons and 143 neutrons.
To keep it short, a nuclide is usually written using the elements abbreviation.
Protons and neutrons together are called nucleons, meaning particles that can appear in the atomic nucleus.
All these methods point to Earth being very, very old -- several billions of years old.In alpha decay, the radioactive atom emits an alpha particle.An alpha particle contains two protons and two neutrons.Different nuclides of the same element can have substantially different half-lives.) billion years old.So, if we know how much of the nuclide was originally present, and how much there is now, we can easily calculate how long it would take for the missing amount to decay, and therefore how long its been since that particular sample was formed. We must know the original quantity of the parent nuclide in order to date our sample In order to do so, we need a nuclide thats part of a mineral compound. Because theres a basic law of chemistry that says "Chemical processes like those that form minerals cannot distinguish between different nuclides of the same element." They simply cant do it.
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In electron absorption, a proton absorbs an electron to become a neutron.