KChapter 8 Geologic Time Geo Tutor: Constructing an Order o Sequence of Geologic

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KChapter 8 Geologic Time Geo Tutor: Constructing an Order o Sequence of Geologic Events-Dating with Radioactivity-1 10 of 14> Although some isotopes are stable, others are unstable because the forces binding protons and neutrons together are not as strong. Unstable isotopes decay to a more stable configuration. The three main types of decay used for radiometric dating are 1. Alpha (?) decay. When an atom undergoes alpha decay, it gives off an alpha particle made up of two protons and two neutrons that come directly from its nucleus. During this process, the atomic mass decreases by 4 and the atomic number decreases by 2. The atomic mass of both parent and daughter elements is a superscript to the left of the elements and the atomic number is a subscript to the right. For example, 238 Ug-234 Tho 2. Beta () decay: When an atom undergoes beta decay, a neutron in the nucleus of an unstable atom is converted into a proton and an electron. The electron is then emitted. During this process, the atomic mass number remains the same and the atomic number increases by 1 For example, 22Th24 Pa 3. Electron capture: In this form of radioactive decay, the nucleus of an atom absorbs an inner atomic electron and converts a proton into a neutron During electron capture, the atomic mass number remains the same but the atomic number decreases by 1 For example, 59Ni8 -50 The daughter elements are the new elements produced due to the radioactive decay of an isotope. For example, 238U ? 234 element and 28U is the parent element here 24 is the daughter Part A The Types of Radioactive Decay Based on the same principles as above, classify the radioactive decays as alpha emission, beta emission, or electron capture Drag the appropriate items into their respective bins. Each item may be used only once View Available Hint(s) ResetHelp 40K19 decays to 40 Ca20 40K19 decays to 40 Ar18 234Thgo decays to 234Pag? Rass decays to 22Rag6 218 Pos4 decays to 214Pbs2 Alpha emission Beta emission Electron capture

Explanation / Answer

alpha emission beta emission electron capture Ra22688 decays to Ra22286 K1940 decays to Ca 4020 K1940 decays to Ar1840 Po21884 decays to Pb21482 Th23490 decays to Pa23491

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