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Physical Science, 5/e

Atomic Structure

# Questions

 1 An electron with a mass of 9.11 x 10-31 kg has a velocity of 4.3 x 106 m/s in the innermost orbit of a hydrogen atom. What is the de Broglie wavelength of the electron? 2 Calculate the energy (a) in eV and (b) in joules of the third energy level (n = 3) of a hydrogen atom. 3 How much energy is needed to move an electron in a hydrogen atom from the ground state (n = 1) to n = 3? Give the answer (a) in joules and (b) in eV. 4 What frequency of light is emitted when an electron in a hydrogen atom jumps from n = 2 to the ground state (n = 1)? 5 How much energy is needed to completely remove an electron from n = 2 in a hydrogen atom? 6 If the charge-to-mass ratio of a proton is 9.58 x 107 coulomb/kilogram and the charge is 1.60 x 10-19 coulomb, what is the mass of the proton? 7 An electron wave making a standing wave in a hydrogen atom has a wavelength of 8.33 x 10-11 m. If the mass of the electron is 9.11 x 10-31 kg, what is the velocity of the electron according to the de Broglie equation? 8 Using any reference you wish, write the complete electron configurations for (a) nitrogen, (b) phosphorus, and (c) chlorine. 9 Explain how you know that you have the correct total number of electrons in your answers for 8a, 8b, and 8c. 10 Referring to Figure 9.21 only, write the complete electron configuration for (a)neon, (b) sulfur, and (c) calcium.