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Justin Roth College ID: 0360782 Thomas Edison State College General Chemistry (CHE-111) Section no. 8 Semester and year: January 2016 Written...

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Name: Justin Roth College ID: 0360782 Thomas Edison State College General Chemistry (CHE-111) Section no.: 8 Semester and year: January 2016 Written Assignment 8: The Electronic Structure of Atoms Answer all assigned questions and problems, and show all work. 1. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 × 10 14 Hz. (a) Calculate the wavelength, in nm, associated with this radiation, and (b) calculate the energy, in joules, of a single photon associated with this frequency. (8 points) a. 2.998x10^8/7.5x10^14 x1nm/10^-9=4.0x10^2 b. 6.626x10^-34x7.5x10^14=5.0x10^-19J (Reference: Chang 7.16) 2. (a) What is an energy level? Explain the difference between ground state and excited state. (b) What are emission spectra: How do line spectra differ from continuous spectra? (6 points) a. Energy levels that are specific orbits so the electron can move about the nucleas. Ground state, all electrons are at the lowest energy level. Excited state, the highest energy electron promote to a higher energy level b. Emission spectra are either continuous or line spectra of radiation. Light spectra are the light emissions only at a specific wavelength and continuous represents all wavelengths of visible light. (Reference: Chang 7.23) 3. Explain the statement , Matter and radiation have “dual nature.” (3 points) Matter has hypothetical dual nature and, radiation has true dual nature. (Reference: Chang 7.35) 4. Which of the four quantum numbers ( n , ℓ, m , m s ) determine (a) the energy of an electron in a hydrogen atom and in a many-electron atom, (b) the size of an orbital, 1
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(c) the shape of an orbital, (d) the orientation of an orbital in space. (4 points) ml a. principle quantum number b. principle quantum number c. angular momentum quantum number d. magnetic quantum number (Reference: Chang 7.54) 5. Determine the maximum number of electrons that can be found in each of the following subshells: 3 s , 3 d , 4 p , 4 f . (2 points) 3s=2 3d=10 4p=6 4f=14 (Reference: Chang 7.65) 6. How many electrons would fill the third energy level ( n = 3)? (2 points) 18 7. Explain the meaning of the symbol 4 d 6 . (2 points) The symbol 4d^6 refers to 6 electrons in the 4d sub orbitals (Reference: Chang 7.72) 8. For each of the following pairs of subshells, indicate which is higher in energy: (a) 2 s or 2 p , (b) 3 d or 4 p , (c) 4 s or 4 p , (d) 3 d or 4 s . (4 points) 2p,3d,4p,3d 9. Explain the meaning of diamagnetic and paramagnetic. Give an example of an element that is diamagnetic and one that is paramagnetic. What does it mean when we say that electrons are paired? (3 points) Paramagnetic refers to elements with unpaired electrons in its subshell. Diamagnetic refers to elements with all paired electrons in its subshell. H is paramagnetic. Be is diamagnetic. It means the electrons are bonded. (Reference: Chang 7.73) 10. Write the ground-state electron configurations for the following elements: (12 points) a. B 1s22s22p1 b. V 1s22s22p63s23p63d34s2 2
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Roth WA8 corrections.docx

Name: Justin Roth
College ID: 0360782
Thomas Edison State College
General Chemistry (CHE-111)
Section no.: 8
Semester and year: January 2016 Written Assignment 8: The Electronic Structure of Atoms...

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