1. The element silicon has 3 isotopes with the masses and natural abundances sho
ID: 607698 • Letter: 1
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1. The element silicon has 3 isotopes with the masses and natural abundances shown in the table. Mass of Isotope Natural abundance 27.97693 92.23 28.97649 4.67 29.97376 3.10 What is the average atomic mass of silicon? a. 28.086 b. 28.000 c. 27.977 d. 28.976 2. What is the number of protons, neutrons and electrons for 3H-? a. protons = 2, neutrons = 1, electrons = 2 b. protons = 1, neutrons = 2, electrons = 2 c. protons = 1, neutrons = 0, electrons = 2 d. protons = 2, neutrons = 1, electrons = 3 3. What is also produced when aluminium-27 is bombarded with deuterium to give aluminium-28? a. neutron b. proton c. positron d. electron 4. What radioactive isotope emits a beta particle to give magnesium-24? a. sodium-24 b. silicon-28 c. aluminium-24 d. magnesium-25 5. Which of the following atoms or ions has the same electronic configuration as Si3-? a. S2+ b. Ar+ c. P- d. Cl- 6. What is the name of GeBr4? a. germanium(IV) bromide b. germanium bromide c. germanium tetrabromide d. germanium(IV) tetrabromide 7. What is the name of N2O4? a. dinitrogen oxide b. tetranitrogen dioxide c. nitrogen tetroxide d. dinitrogen tetroxide 8. What is the formula for manganese(II) hydroxide? a. Mn2(OH)2 b. Mn(OH)2 c. MnOH2 d. Mn(OH2) 9. What is the formula for aluminium sulfate? a. Al3S2 b. Al(SO4)3 c. Al2(SO4)3 d. Al2S3 10. The half-life of carbon-14 is 5730 years. How much of a sample that initially contains 74.4 g carbon-14 will remain after 17190 years? a. 9.3 g b. 18.6 g c. 24.8 g d. 37.2 gExplanation / Answer
Silicon isotopes are used in a variety of applications. Si-28 has been suggested to improve the thermal conductivity of semiconductors. Si-29 is used extensively in NMR spectroscopy. Si-30 has been used to produce the radioisotope Si-31. Si-30 has also been used to study the self-diffusivity of Silicon and it has been used to study the isotope effect on superconductivity Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (µ/µN) 28Si 27.9769271 (7) 92.2297 (7) 0 0 29Si 28.9764949 (7) 4.6832 (5) 1/2 -0.55529 30Si 29.9737707 (7) 3.0872 (5) 0 0
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