Ch.7 - Quantum MechanicsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Additional Problems
When an electron of an excited hydrogen atom falls from level n = 3 to level n = 1, what is the frequency (in s-1) of the light emitted? a. 2.92 x1 0 15 b. 3.43 x 10 -16 c. 1.62 x 10 -15 d. 6.17 x 10 14 e. 4.00 x 10 19
How much energy is emitted in kJ/mol when an electron in the H atom transitions from n = 6 to n = 2? A. 275 B. 292 C. 302  D. 310 E. 321
 For a hydrogen atom, calculate the energy (in kJ) of a photon in the Balmer series that results from the transition n = 5 to n = 2. a. 1.09x10 -20 kJ b. 2.04x10 -21 kJ c. 2.18x10 -21 kJ d. 3.03x10 -22 kJ e. 4.58x10 -22 kJ
Atoms with one electron can be modeled with an equation similar to the Bohr equation:          Ea = -2.179x10-18 J (Z2/n2) In the equation, Z is the nuclear charge and n is the shell in which the electron resides. What is the ionization energy of Li2+, assuming its electron is originally in the n=1 level? A. 984.1 kJ/mol B. 1312 kJ/mol C. 495 kJ/mol D. 3937 kJ/mol E. 2953 kJ/mol  
What is the energy of the light emitted from a hydrogen atom as it relaxes from  the n = 5 to n = 3 excited states?                   What is the wavelength of the emitted light?    
How much energy is emitted in kJ/mol when an electron in the H atom transitions from n=6 to n=2? A. 275 B. 292 C 302 D. 310 E. 321
Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n = 3 to n = 1 energy level, based on the Bohr theory. Use the equation En = -2.18 x 10 -18 J [(1/nf2)-(1/ni2)] a. 2.92 x 1015 s-1 b. 3.56 x 1014 s-1 c. 2.92 x 1014 s-1 d. 1.17 x 1015 s-1
The electron in the  n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move? 1. 5 2. 9 3. 8 4. 4 5. 6 6. 2 7. 7 8. 3 9. 1
A hydrogen atom initially in the n - 6 state emits a photon of ligiht of wavelength: λ = 1093 nm The value for n after emission of the photon is a. n = 1 b. n = 2 c. n = 3 d. n = 4 e. n = 5
The Rydberg equation is an empirical equation that describes mathematically 1. the lines in the emission spectrum of hydrogen. 2. the results of the cathode ray experiments. 3. the results of the oil drop experiment. 4. the Bohr model of the atom 5. the possible paths of two isotopes of the same element in a constant magnetic field in a mass spectrometer.
A hydrogen atom absorbs a photon with a wavelength of 397.1 nm, which excites the atom’s electron. Determine the electron’s initial quantum level if the transition results in a final quantum level of n = 7. a) n = 4 b) n = 3 c) n = 1 d) n = 2 e) n = 5
What is the frequency in Hz of the photon released when a hydrogen atom undergoes a transition from the excited state where n = 2 to the state where n = 1?
An electron in a hydrogen atom moves from the n = 2 to n = 5 level. What is the wavelength of the photon that corresponds to this transition and is the photon emitted or absorbed during this process? 1. 1875 nm; emitted 2. 434 nm; absorbed 3. 276 nm; emitted 4. 1875 nm; absorbed 5. 276 nm; absorbed 6. 434 nm; emitted 
It is possible to determine the ionization energy for hydrogen using the Bohr equation. Calculate the ionization energy (in kJ) for a mole of hydrogen atoms, making the assumption that ionization is the transition from n = 1 to n = ∞. A. 7.62 x 103 kJ B. 2.76 x 103 kJ C. 1.31 x 103 kJ D. 3.62 x 103 kJ E. 5.33 x 103 kJ
Calculate the wavelength of light produced if an electron moves from n = 6 to n = 1.
An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397 nm.What is the value of n for the level to which the electron relaxed?
An atomic emission spectrum of hydrogen shows the following three wavelengths: 1875 nm, 1282 nm, and 1093 nm. Assign these wavelengths to transitions in the hydrogen atom.For nm = 1875 { m nm}.
An atomic emission spectrum of hydrogen shows the following three wavelengths: 1875 nm, 1282 nm, and 1093 nm. Assign these wavelengths to transitions in the hydrogen atom.For nm = 1282 { m nm}.
An atomic emission spectrum of hydrogen shows the following three wavelengths: 1875 nm, 1282 nm, and 1093 nm. Assign these wavelengths to transitions in the hydrogen atom.For nm = 1093 { m nm}.
Calculate the wavelength of the radiation released when an electron moves from n = 6 to n =2.
With reference to the figure below, are the allowed energy states in the Bohr model for the H atom more like steps or more like a ramp?
As the energy level of an orbit becomes more negative, does the electron experience a stronger or weaker attraction to the nucleus?
For an He+ ion, do the 2s and 2p orbitals have the same energy?
If you put 120 volts of electricity through a pickle, the pickle will smoke and start glowing orange-yellow. The light is emitted because sodium ions in the pickle become excited; their return to the ground state results in light emission.Calculate the energy gap between the excited and ground states for the sodium ion.
Using equation E= (hcRH)(1n2) = (-2.1810-18J)(1n2), calculate the energy of an electron in the hydrogen atom when n=2.
Using equation E= (hcRH)(1n2) = (-2.1810-18J)(1n2), calculate the energy of an electron in the hydrogen atom when n = 6.
How much energy does the electron have initially in the n = 4 excited state? Enter your answer numerically in joules.   What is the change in energy if the electron from Part A now drops to the ground state? Enter your answer numerically in joules.
For each of the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation, and determine whether the radiation is emitted or absorbed during the transition: (b) from n = 5 to n = 2
For each of the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation, and determine whether the radiation is emitted or absorbed during the transition: (c) from n = 3 to n= 6. Does any of these transitions emit or absorb visible light?
What wavelength of light will be required to remove an electron from the n = 3 shell of a hydrogen atom?
What is the wavelength of the light emitted from a hydrogen atom when an electron moves from the n = 6 to n = 2 energy level?R = 1.096776 x 107 m-1.A. 2.74 x 10-7 mB. 4.10 x 10-7 mC. 2.22 x 10-1 mD. 2.44 x 106 mE. 3.65 x 106 m
An electron in the n=7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397 nm. What is the value of n for the level to which the electron relaxed?
One of the emission lines of the hydrogen atom has a wavelength of 93.8 nm. (b) Determine the initial and final values of n associated with this emission.
Calculate the wavelength of light associated with the transition from n=1 to n=3 in the hydrogen atom. A. 103 nm                 B. 155 nm                 C. 646 nm                 D. 971 nm                 E. 136 nm
An excited hydrogen atom emits a photon with a frequency of 1.141 x 10 14 Hz to reach the n = 4 state. From what state did the electron originate?  a) n=2 b) n=3 c) n=5 d) n=6 
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 6 to n = 1.
Using Bohr's equation for the energy levels of the electron in the hydrogen atom, determine the energy (J) of an electron in the n = 4 level.a) -5.45 x 10 -19b) -1.84 x 10 -29c) -1.36 x 10 -19d) +1.84 x 10 -29e) -7.34 x 1018
Calculate the energy, in joules, required to excite a hydrogen atom by causing an electronic transition from the n = 1 to the n = 4 principal energy level.a. 2.07 x 10-29 J b. 2.19 x 105 J c. 2.04 x 10-18 J d. 3.27 x 10-17 J e. 2.25 x 10-18 J
The n = 2 to n = 10 transition in the Bohr hydrogen atom corresponds to the __________ of a photon with a wavelength of __________nm. a) emission, 380 b) absorption, 380 c) absorption, 657 d) emission, 657 e) emission, 389
Solving the Rydberg equation for energy change gives ΔE = R∞hc [1/n12 - 1/n22] where the Rydberg constant R∞ for hydrogen-like atoms is 1.097 x 107 m-1 Z2, and Z is the atomic number. (a) Calculate the energies needed to remove an electron from the n = 2 state and the n = 6 state in the Li2+ ion. n = 2  ____ x 10___ J                n = 6  ____ x 10___ J (Enter your answer in scientific notation.) (b) What is the wavelength (in nm) of the emitted photon in a transition from n = 6 to n = 2? _____ nm
What wavelength of light (in nm) if absorbed by a ground-state hydrogen atom could cause an electron to transition to n=3?  
An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated?
The second line of the Balmer series occurs at wavelength of 486.13 nm. To which transition can we attribute this line?a) n = 6 to n = 2b) n = 5 to n = 2c) n = 4 to n = 2d) n = 3 to n = 2e) it is to the n = 1 level
Consider a hydrogen atom in the ground state. What is the energy (in J) of its electron?     Now consider an excited-state hydrogen atom. What is the energy (in J) of the electron in the n = 3 level?       
Consider a hydrogen atom in the ground state. What is the energy of its electron? Now consider an excited- state hydrogen atom. What is the energy of the electron in the n=4 level?
A red laser pointer emits light with a wavelength of 650 nm. (c) The laser pointer emits light because electrons in the material are excited (by a battery) from their ground state to an upper excited state. When the electrons return to the ground state, they lose the excess energy in the form of 650 nm photons. What is the energy gap between the ground state and excited state in the laser material?
An excited hydrogen atom emits light with a wavelength of 397.2 nm to reach the energy level for which n = 2. In which principal quantum level did the electron begin?
Suppose energy is delivered to atoms of fluorine, chlorine, bromine, and iodine sufficient to cause each atom’s outermost electron to jump to the n=7 state. Now imagine that these electrons return to the ground state, giving off light as they fall. Which gas will emit light of the highest frequency?1. iodine2. chlorine3. fluorine 4. bromine
A hydrogen atom emits light in an electronic transition going from n=4 to n=2 lower shell. 1.) What is the frequency of this light?  2.) What wavelength is this and what color will it appear to the eye?(R = 2.18x10 -18 J; h = 6.63 x 10 -34 J•sec; c = 3.00x10 8 m/sec;1 nm = 10 -9 m) 
Calculate the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n = 5 to an orbital with n = 3.
An electron in the n = 6 level of the hydrogen atom relaxes to a lower energy level, emitting light of λ = 410 nm. { m ; m nmFind the principal level to which the electron relaxed.
What is the significance of the minus sign in front of ΔE in the following equation?Ephoton = hν = –ΔE = +1.94 x 10–18 Jlarge{{ ormalsize lambda} = {frac {c}{ u}} = {frac {hc}{E_{ m photon}}} = {frac{hc} {-Delta E}}}
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 4 → n = 3
In the top part of image below, the four lines in the H atom spectrum are due to transitions from a level for which ni > 2 to the nf = 2 level. What is the value of ni for the red line in the spectrum?
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 5 → n = 1
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 5 → n = 4
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 6 → n = 5
An electron in a hydrogen atom relaxes to the n =4 level, emitting light of 114 THz.What is the value of n for the level in which the electron originated?
A ground-state H atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate energy level, and a second to return to the ground state. What higher level did the electron reach?
A ground-state H atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate energy level, and a second to return to the ground state. What intermediate level did the electron reach?
A ground-state H atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate energy level, and a second to return to the ground state. What was the wavelength of the second photon emitted?
Before quantum mechanics was developed, Johannes Rydberg developed an equation that predicted the wavelengths (λlambda) in the atomic spectrum of hydrogen: 1/λ = R(1/m2 - 1/n2). In this equation R is a constant and m and n are integers. Use the quantum-mechanical model for the hydrogen atom to derive the Rydberg equation.
One of the visible lines in the hydrogen emission spectrum corresponds to the n=6 to n=2 electronic transition. What color light is this transition? Refer to the following figure.
You may want to reference (Pages 219 - 224) Section 6.3 while completing this problem.Consider a transition of the electron in the hydrogen atom from n = 4 to n = 9. Determine the wavelength of light that is associated with this transition.
You may want to reference (Pages 219 - 224) Section 6.3 while completing this problem.Consider a transition of the electron in the hydrogen atom from n = 4 to n = 9. In which portion of the electromagnetic spectrum is the light from the transition?
You may want to reference (Pages 219 - 224) Section 6.3 while completing this problem.Consider a transition in which the hydrogen atom is excited from n = 1 to n = ∞. What is the wavelength of light that must be absorbed to accomplish this process?
Atomic hydrogen produces several series of spectral lines. Each series fits the Rydberg equation with its own particular n1 value. Calculate the value of n1 (by trial and error if necessary) that would produce a series of lines in which the highest energy line has a wavelength of 3282 nm.
Atomic hydrogen produces several series of spectral lines. Each series fits the Rydberg equation with its own particular n1 value. Calculate the value of n1 (by trial and error if necessary) that would produce a series of lines in which the lowest energy line has a wavelength of 7460 nm.
Use the Rydberg equation to find the wavelength (in nm) of the photon emitted when an electron in an H atom undergoes a transition from n = 5 to n = 2.
Use the Rydberg equation to find the wavelength (in Å) of the photon absorbed when an electron in an H atom undergoes a transition from n = 1 to n = 3.
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 3 → n = 2What type of electromagnetic radiation is emitted?
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 4 → n = 2What type of electromagnetic radiation is emitted?
The electron in a ground-state H atom absorbs a photon of wavelength 97.20 nm. To what energy level does it move?
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 2 → n = 1
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 2 → n = 1What type of electromagnetic radiation is emitted?
An electron in the n = 5 level of an H atom emits a photon of wavelength 1281 nm. To what energy level does it move?
Consider a large number of hydrogen atoms with electrons randomly distributed in the n = 1, 2, 3, and 4 orbits.How many different wavelengths of light are emitted by these atoms as the electrons fall into lower-energy orbitals?
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 3 → n = 1
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 4 → n = 2
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions.n = 5 → n = 2
Calculate the wavelength of the light emitted when an electron in a hydrogen atom makes each of the following transitions. Indicate the region of the electromagnetic spectrum (infrared, visible, ultraviolet, or microwave) where each transition is found.a. n = 2 → n = 1b. n = 3 → n = 1c. n = 4 → n = 2d. n = 5 → n = 2
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 4 → n = 3What type of electromagnetic radiation is emitted?
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 5 → n = 4What type of electromagnetic radiation is emitted?
Calculate the wavelength of light emitted when the following transition occur in the hydrogen atom. n = 5 → n = 3What type of electromagnetic radiation is emitted?
Consider a large number of hydrogen atoms with electrons randomly distributed in the n = 1, 2, 3, and 4 orbits.Calculate the frequencies and wavelengths of the light produced by these atoms as the electrons fall into lower-energy orbitals?
Calculate the longest and shortest wavelengths of light emitted by electrons in the hydrogen atom that begin in the n = 6 state and then fall to states with smaller values of  n.
Calculate, to four significant figures, the longest and shortest wavelengths of light emitted by electrons in the hydrogen atom that begin in the n = 5 state and then fall to states with smaller values of n.
Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n = 2 level to an orbital in the n =7 level.
Consider an electron for a hydrogen atom in an excited state. The maximum wavelength of electromagnetic radiation that can completely remove (ionize) the electron from the H atom is 1460 nm. What is the initial excited state for the electron (n = ?)?
An excited hydrogen atom with an electron in the  n = 5 state emits light having a frequency of 6.90 x 1014 s-1. Determine the principal quantum level for the final state in this electronic transition.
Calculate the wavelength of the radiation released when an electron moves from n = 6 to n = 2. Is this line in the visible region of the electromagnetic spectrum? If so, what color is it?
The laser pointer emits light because electrons in the material are excited (by a battery) from their ground state to an upper excited state. When the electrons return to the ground state, they lose the excess energy in the form of 533-nm photons. What is the energy gap between the ground state and excited state in the laser material?
A metal ion M n+ has a single electron. The highest energy line in its emission spectrum has a frequency of 2.961 x 1016 Hz. Identify the ion.
X-ray diffractometers often use metals that have had their core electrons excited as a source of X rays. Consider the 2p → 1s transition for copper, which is called the Kα transition. Calculate the wavelength of X rays (in angstroms) given off by the Kα transition if the energy given off by a mole of copper atoms is 7.77 × 105 kJ . (Note that 1Å = 10-10 m)
What is the energy (in J) of an H atom with an electron at  n = 3?
What is the energy of an Li  2+ ion with its electron in the  n = 3 orbit?
Photoelectron spectroscopy applies the principle of the photoelectric effect to study orbital energies of atoms and molecules. High-energy radiation (usually UV or x-ray) is absorbed by a sample and an electron is ejected. The orbital energy can be calculated from the known energy of the radiation and the measured energy of the electron lost. The following energy differences were determined for several electron transitions:ΔE2⟶1 = 4.098 x 10−17 J               ΔE  3⟶1 = 4.854 x 10−17 JΔE5⟶1 = 5.242 x 10−17 J               ΔE  4⟶2 = 1.024 x 10−17 JCalculate ΔE and λ of a photon emitted in the transitions level 3 → 2.
You may want to reference (Pages 219 - 224) Section 6.3 while completing this problem.Consider a transition of the electron in the hydrogen atom from n = 4 to n = 9. Is ΔE for this process positive or negative?
Using the Bohr model, determine the energy, in joules, necessary to ionize a ground-state hydrogen atom. Show your calculations.
The electron volt (eV) is a convenient unit of energy for expressing atomic-scale energies. It is the amount of energy that an electron gains when subjected to a potential of 1 volt; 1 eV = 1.602 × 10–19 J. Using the Bohr model, determine the energy, in electron volts, of the photon produced when an electron in a hydrogen atom moves from the orbit with n = 5 to the orbit with n = 2. Show your calculations.
Using the Bohr model, determine the lowest possible energy, in joules, for the electron in the Li2+ ion.
Using the Bohr model, determine the lowest possible energy for the electron in the He+ ion.
Using the Bohr model, determine the energy of an electron with n = 6 in a hydrogen atom.
Using the Bohr model, determine the energy of an electron with n = 8 in a hydrogen atom.
Calculate the energy difference (ΔE) for the transition of the least energetic spectral line in the infrared series for 1 mol of H atoms.
Using the Bohr model, determine the energy in joules of the photon produced when an electron in a He+ ion moves from the orbit with n = 5 to the orbit with n = 2.
Calculate the energy difference (ΔE) when an electron in an H atom undergoes a transition from n = 1 to n = 3. for 1 mol of H atoms.
Using the Bohr model, determine the energy in joules of the photon produced when an electron in a Li 2+ ion moves from the orbit with n = 2 to the orbit with n = 1.
Consider a large number of hydrogen atoms with electrons randomly distributed in the n = 1, 2, 3, and 4 orbits.Calculate the lowest and highest energies of light produced by these atoms as the electrons fall into lower-energy orbitals?
Does a photon of visible light (λ ≈ 400 to 700 nm) have sufficient energy to excite an electron in a hydrogen atom from the n = 1 to the n = 5 energy state? From the n = 2 to the n = 6 energy state?
The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation En = (n + 1/2)hν, where n is a quantum number with possible values of 1, 2, ..., and ν is the frequency of vibration. The vibration frequency of HCl is approximately 8.85 x 1013 s-18.85; imes ;10^{13} ;{ m{s}}^{ - 1}. Starting with a "stationary" molecule, what minimum energy is required to excite a vibration in HCl?
The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation En = (n + 1/2)hν, where n is a quantum number with possible values of 1, 2, ..., and ν is the frequency of vibration. The vibration frequency of HCl is approximately 8.85 x 1013 s-1. What wavelength of light is required to excite this vibration?
An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 138 THz.What is the value of n for the level in which the electron originated? Express your answer as an integer.
An excited hydrogen atom emits light with a frequency of 2.34 x 1014 Hz to reach the energy level for which n = 3. In what principal quantum level did the electron begin? a. 2 b. 5 c. 4 d. 6 e. none of the above
What are the wavelengths, in nanometers, of the bright lines of the hydrogen emission spectrum corresponding to the transition: n = 5 to n = 2.
Enter your answer in the provided box.Recall Planck's constant equals 6.63 x 10-34 J • s and the speed of light is 3.00 x 108 m/s. Calculate the wavelength (in am) of a photon emitted by a hydrogen atom when its electron drops from the n = 4 state to the n = 2 state.
Calculate the energy released when an electron falls from the n = 8 energy level to the n = 1 energy level in a hydrogen atom. 
Calculate the wavelength (in nm) of a photon (emitted/absorbed) when an electron on hydrogen moves from the n = 6 to the n = 11 shell.
What is the wavelength of the photons emitted by hydrogen atoms when they undergo n = 3 to n = 2 transitions? In which region of the electromagnetic spectrum does this radiation occur? a. Ultraviolet b. Infrared c. Microwaves d. Visible
Calculate the energy released when an electron falls from the n = 8 energy level to the n = 1 energy level in a hydrogen atom. 
Calculate the wavelength of light produced if an electron moves from n = 5 state to n = 3 state of an electron in a hydrogen atom.Express your answer to three significant figures and include the appropriate units. 
An electron in the n = 5 level of an H atom emits a photon of wavelength 434.17 nm. To what energy level does the electron move?
Determine the energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom.a. +3.76 x 10 -19 Jb. +6.54 x 10 -19 Jc. -1.53 x 10 -19 Jd. -2.18 x 10 -19 Je. +4.58 x 10 -19 J
How much energy does the electron have initially in the n=4 excited state? Enter your answer numerically in joules.    What is the change in energy if the electron from Part A now drops to the ground state? Enter your answer numerically in joules.
What is the energy (in kJ) of one photon of the electronic transition from n = 6 to n = 3 in hydrogen atom? Show your work for credit. 
Consider an element that reaches its first excited state by absorption of 379.0 nm light.a) Determine the energy difference (kJ/mol) between the ground state and the first excited state.b) If the degeneracies of the two states for the element are g*/go = 1, determine N*/N_0 at 2090 Kc) By what percentage does N*/N_0 change if the temperature is raised by 20 K?d) What is N*/N_0 at 5970 K?
How much energy is required to ionize hydrogen: a. When it is in the ground state and b. When it is in the 2nd excited state with n = 3.