Chapter 21 Outline

Chapter 21 Outline - Joseph Chapter 21 Nuclear Chemistry...

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Joseph Chapter 21 Nuclear Chemistry The Nucleus Remember that the nucleus is comprised of the two nucleons, protons and neutrons. The number of protons is the atomic number. The number of protons and neutrons together is effectively the mass of the atom. Isotopes Not all atoms of the same element have the same mass due to different numbers of neutrons in those atoms. Radioactivity It is not uncommon for some nuclides of an element to be unstable, or radioactive. We refer to these as radionuclides. There are several ways radionuclides can decay into a different nuclide. Types of Radioactive Decay Positron Emission: Loss of a positron (a particle that has the same mass as but opposite charge than an electron) Gamma Emission: Loss of a γ -ray (high-energy radiation that almost always accompanies the loss of a nuclear particle) Electron Capture (K-Capture) -Addition of an electron to a proton in the nucleus -As a result, a proton is transformed into a neutron.
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Chapter 21 Outline - Joseph Chapter 21 Nuclear Chemistry...

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