Lecture19_Chapter19

Lecture19_Chapter19 - 10/26/2008 Home Work Lecture 19...

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10/26/2008 1 Lecture 19 Chapters 19 Radioactivity Home Work • Chapter 19 • Key Terms • Review Questions 2, 5, 9, 11 • Exercises: 1, 5, 6 Mendeleev’s Periodic Table Radioactivity Not all elements in periodic table are stable! Radioactivity is the process by which certain elements emit particular forms of radiation. There are three major forms of radioactivity: alpha, beta, and gamma Radioactivity is a natural phenomena • Sources of natural radioactivity include - Cosmic radiation - Ground Air (radon 222 - Air (radon -222) - Human tissues (potassium-40; radium- 226) Gamma Radiation ! - radiation is an extremely energetic form of electromagnetic radiation!
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10/26/2008 2 Beta particles " - particles are electrons – negatively charged particles that are ejected by atomic nucleus. T 1/2 = 15 minutes Alpha particles # -particle is the nucleus of a helium atom consisting of two protons and two neutrons Transmutation When atomic nucleus emits an alpha or a beta particle, the atomic
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Lecture19_Chapter19 - 10/26/2008 Home Work Lecture 19...

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