Some of the isotopes of silicon are listed in the following table: 14.5, 4.6, 5.2, 5.4

Chapter 0, Problem C1.9

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Some of the isotopes of silicon are listed in the following table: 14.5, 4.6, 5.2, 5.4, 6.6, 6.72 Isotope % Natural Abundance Atomic Mass Half-Life 1radioactive2 Radiation 27 14Si 26.987 4.9 s Positron 28 14Si 92.23 27.977 Stable None 29 14Si 4.683 28.976 Stable None 30 14Si 3.087 29.974 Stable None 31 14Si 30.975 2.6 h Beta a. In the following table, indicate the number of protons, neutrons, and electrons for each isotope listed: Isotope Number of Protons Number of Neutrons Number of Electrons 27 14Si 28 14Si 29 14Si 30 14Si 31 14Si b. What is the electron arrangement of silicon? c. Calculate the atomic mass for silicon using the isotopes that have a natural abundance. d. Write the balanced nuclear equations for the positron emission of Si-27 and the beta decay of Si-31. e. Draw the electron-dot formula and predict the shape of SiCl4. f. How many hours are needed for a sample of Si-31 with an activity of 16 mCi to decay to 2.0 mCi?