Chapter 28 Atomic Physics CHAPTER 28 Conceptual Questions C1 Consider the hydrogen atom singly ionized helium atom and the doubly ionized lithium atom Arrange these atoms from highest energy ground state to lowest energy ground state a H He Li b Li He H c H Li He d Since each of these atoms has only one electron they all have the same energy ground state C2 In the n 4 shell how many distinct values of m are possible a 4 b 8 c 9 d The correct value is not given C3 Selenium has atomic number 34 In its ground state how many electrons are in its n 2 shell a 2 b 8 c 10 d 16 C4 If a hydrogen atom originally in its ground state of energy 13 6 eV absorbs a photon of energy 15 0 eV what is the resulting kinetic energy of the electron if the proton has negligible kinetic energy a Such a photon cannot be absorbed in this case b 1 4 eV c 1 4 eV d 15 0 eV C5 For the n 4 shell what are the lowest values possible for and m respectively a 0 0 b 4 4 c 0 3 d 3 3 222 Chapter 28 Atomic Physics 28 1 Early Models of the Atom 28 2 Atomic Spectra 1 When a wire carries high current causing it to glow it will emit which type of spectrum a line emission b line absorption c continuous d monochromatic 2 When a high voltage is applied to a low pressure gas causing it to glow it will emit which type of spectrum a line emission b line absorption c continuous d monochromatic 3 When a cool gas is placed between a glowing wire filament source and a diffraction grating the resultant spectrum from the grating is which one of the following a line emission b line absorption c continuous d monochromatic 4 What is the wavelength of the line in the Balmer series of hydrogen that is comprised of transitions from the n 4 to the n 2 level R 1 097 107 m 1 and 1 nm 10 9 m a 380 nm b 486 nm c 523 nm d 630 nm 5 An alpha particle is a a neutral helium atom b any positively charged nucleus c an x ray d None of the above 223 Chapter 28 Atomic Physics 6 According to the Rutherford model of the atom most of the volume of an atom a is empty space b was occupied by the nucleus c contained positive charges d excluded electrons 7 In contrast to Thomson s model of the atom Rutherford s model a had the positive charge spread uniformly through the atom b had the positive charge concentrated in a small region c was first to explain atoms emitting discrete frequencies d eliminated radiation from accelerating charges 28 3 The Bohr Model 8 The Lyman series of hydrogen is made up of those transitions made from higher levels to n 1 If the first line in this series has a wavelength of 122 nm what is the wavelength of the second line a 49 nm b 103 nm c 364 nm d 486 nm 9 The ionization energy for the hydrogen atom is 13 6 eV What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n 4 and n 2 states a 0 85 eV b 2 55 eV c 3 40 eV d 6 80 eV 10 Of the various wavelengths emitted from a hydrogen gas discharge tube those that are associated with transitions from higher levels down to the n 1 level produce which of the following a infrared b visible c mixture of infrared and visible d ultraviolet 224 Chapter 28 Atomic Physics 11 Of the various wavelengths emitted from a hydrogen gas discharge tube those associated with transitions from higher levels down to the n 2 level produce which of the following a infrared b visible c mixture of visible and ultraviolet d ultraviolet 12 What is the wavelength of the line in the Paschen series of hydrogen that is comprised of transitions from the n 4 to the n 3 levels R 1 097 107 m 1 and 1 nm 10 9 m a 1 282 nm b 1 875 nm c 1 923 nm d 2 251 nm 13 The ionization energy of the hydrogen atom is 13 6 eV What is the energy of the n 5 state a 2 72 eV b 2 72 eV c 0 544 eV d 0 544 eV 14 The ionization energy of the hydrogen atom is 13 6 eV What is the energy of a photon emitted corresponding to a transition from the n 5 to n 2 state a 2 9 eV b 3 5 eV c 4 0 eV d 7 9 eV 15 If the radius of the electron orbit in the n 1 level of the hydrogen atoms is 0 052 9 nm what is its radius for the n 5 level Assume the Bohr model is valid a 0 106 nm b 0 265 nm c 0 846 nm d 1 32 nm 16 The Paschen series of hydrogen corresponds to electron transitions from higher levels to n 3 What is the shortest wavelength in that series R 1 097 107 m 1 and 1 nm 10 9 m 225 Chapter 28 Atomic Physics a 365 nm b 820 nm c 1 094 nm d 313 nm 17 The Lyman series of hydrogen corresponds to electron transitions from higher levels to n 1 What is the longest wavelength in that series R 1 097 107 m 1 and 1 nm 10 9 m a 91 4 nm b 122 nm c 273 nm d 456 nm 226 Chapter 28 Atomic Physics 18 The ionization energy of the hydrogen atom is 13 6 eV What is the wavelength of a photon having this much energy h 6 63 10 34 J s c 3 00 108 m s 1 eV 1 6 10 19 J and 1 nm 10 9 m a 91 4 nm b 136 nm c 273 nm d 360 nm 19 The four visible colors emitted by hydrogen atoms are produced by electrons a that start in the ground state b that end up in the ground state c that start in the level with n 2 d that end up in the level with n 2 20 The visible lines from hydrogen are all members of the a Lyman series b Balmer series c Paschen series d Brackett series 21 The emission of a line from the Balmer series is followed almost immediately by the emission of a line from the Lyman series This will be true for a only the first line of the Balmer series and the first line of the Lyman series b all the lines of the Balmer series followed by only the first line of the Lyman series c only the first line of the Balmer series followed by any of the …