A neutron with a mass of 1.68 × 10-27 kg moves from a nuclear reactor with a velocity of 3.22 × 103 m/s. What is the de Broglie wavelength of the neutron? Click here to see the answer
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How much energy is needed to move an electron in a hydrogen atom from n = 2 to n = 6? Give the answer (a) in joules and (b) in eV. (See Figure 8.11 for needed values.) Click here to see the answer
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What frequency of light is emitted when an electron in a hydrogen atom jumps from n = 6 to n = 2? What color would you see? Click here to see the answer
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Thomson determined the charge-to-mass ratio of the electron to be -1.76 × 1011 coulomb/kilogram. Millikan determined the charge on the electron to be -1.60 × 10-19 coulomb. According to these findings, what is the mass of an electron? Click here to see the answer
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Assume that an electron wave making a standing wave in a hydrogen atom has a wavelength of 1.67 × 10-10 m. Considering the mass of an electron to be 9.11 × 10-31 kg, use the de Broglie equation to calculate the velocity of an electron in this orbit. Click here to see the answer
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Using any reference you wish, write the complete electron configurations for (a) boron, (b) aluminum, and (c) potassium. Click here to see the answer
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Explain how you know that you have the correct total number of electrons in your answers for 8a, 8b, and 8c. Click here to see the answer
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Refer to Figure 8.18 only, and write the complete electron configurations for (a) argon, (b) zinc, and (c) bromine. Click here to see the answer
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Lithium has two naturally occurring isotopes: lithium-6 and lithium-7. Lithium-6 has a mass of 6.01512 relative to carbon-12 and makes up 7.42 percent of all naturally occurring lithium. Lithium-7 has a mass of 7.016 compared to carbon-12 and makes up the remaining 92.58 percent. According to this information, what is the atomic weight of lithium? Click here to see the answer
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Identify the period and the family in the periodic table for the following elements: (a) Radon (b) Sodium (c) Copper (d) Neon (e) Iodine (f) Lead Click here to see the answer
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Write electron dot notations for the following elements: (a) Boron (b) Bromine (c) Calcium (d) Potassium (e) Oxygen (f) Sulfur Click here to see the answer
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Identify the charge on the following ions: (a) Boron (b) Bromine (c) Calcium (d) Potassium (e) Oxygen (f) Nitrogen Click here to see the answer
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Use the periodic table to identify if the following are metals, nonmetals, or semiconductors: (a) Krypton (b) Cesium (c) Silicon (d) Sulfur (e) Molybdenum (f) Plutonium Click here to see the answer
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From their charges, predict the periodic table family number for the following ions: (a) Br-1 (b) K+1 (c) Al+3 (d) S-2 (e) Ba+2 (f) O-2 Click here to see the answer
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Use chemical symbols and numbers to identify the following isotopes: (a) Oxygen-16 (b) Sodium-23 (c) Hydrogen-3 (d) Chlorine-35 Click here to see the answer
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Figure 8_11
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