1 / 27

280 likes | 435 Views

Chapter 7: Atomic Structure & Periodicity. Wave Theory of Electromagnetic Radiation Particle Theory of Electromagnetic Radiation (UV Catastrophe & Photoelectric Effect) Particle and Wave Theories of Matter (deBroglie wavelengths & Uncertainty Principle)

Download Presentation
## Chapter 7: Atomic Structure & Periodicity

**An Image/Link below is provided (as is) to download presentation**
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.
Content is provided to you AS IS for your information and personal use only.
Download presentation by click this link.
While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

**Chapter 7: Atomic Structure & Periodicity**• Wave Theory of Electromagnetic Radiation • Particle Theory of Electromagnetic Radiation (UV Catastrophe & Photoelectric Effect) • Particle and Wave Theories of Matter (deBroglie wavelengths & Uncertainty Principle) • Atomic Spectra & Bohr’s Model of the Atom • Quantum Mechanical Model of the Atom (quantum numbers, orbitals) • Electron Spin & Pauli Exclusion Principle • Electron Configurations • Periodic Trends in IE, EA, and Atomic Radius • Relationship between Electron Config & Reactivity: Group IA**The Electromagnetic Spectrum**http://www.flandrau.org/WEBSITE/Background.htm**Separating Wavelengths of Light**http://www.phys.ufl.edu/~avery/course/3400/light/prism.gif**Example 1**What is the frequency of the red laser light used in grocery store scanners if it has a wavelength of 6328A? 1A = 10-10 m. Answer: 4.741 x 1014 /s**Example 2**What wavelength of electromagnetic radiation is broadcast by KCRW at 89.9 MHz? Answer: 3.34 m**The Ultraviolet Catastrophe**http://www.chem.ufl.edu/~chm2040/ Images/Chapter/Chap_9/g13f5.gif**The Photoelectric Effect**http://www.astro.queensu.ca/~hanes/ p014/Notes/Figures/PE_Effect.gif**Example 3**The work function for Cr metal is 652.7 kJ/mole. Find: • The energy (in J) needed to remove an electron from one atom of Cr. • The minimum energy (in J) a photon must have to ionize Cr. • The maximum wavelength (in nm) of light that can ionize Cr. Answers: a. 1.084 x 10-18 J / atom b. 1.084 x 10-18 J c. 183.4 nm**Example 4**The work function of sodium metal is 496 kJ/mole. What is the maximum wavelength of light that can ionize sodium? Can light at 255 nm ionize sodium? Answer: 241 nm; no**Example 5**Challenge Problem: When light with a wavelength of 86.0 nm is incident upon a metal surface, electrons are ejected with a velocity of 4.25 x 105 m/s. What is the work function of this metal in kJ/mole? Answer: 1342 kJ/mole**Atomic Spectra,Emission & Absorption**http://www.cbu.edu/~jvarrian/252/ emspex.jpg**Example 6**According to Bohr’s theory, what is the energy of an electron in the n=5 orbit of a hydrogen atom? Answer: E5 = -8.72 x 10–20 J**Example 7**How much energy is lost by an electron when it moves from the n=3 orbit to the n=1 orbit of a hydrogen atom? What wavelength of light will be emitted by the electron when it makes this transition? Answer: 1.938 x 10-18 J; 103 nm**Example 8**A spectral line in the Balmer series for hydrogen occurs at 397 nm. What electronic transition is responsible for this line? Answer: n=7 n=2**Example 9**What is the deBroglie wavelength of: • A baseball with a mass of 140 g and a velocity of 25 m/s? • An electron with a velocity of 1.0 x 104 m/s? Answer: a) 1.9 x 10-34 m b) 7.3 x 10-8 m**Example 10**What is the minimum uncertainty we can have in the position of an electron moving at a velocity of 5.0 x 105 m/s? The mass of an electron is 9.109 x 10-31 kg. Hint: Start by calculating the uncertainty in the velocity! Answer: 1 x 10-8 m or 10 nm**Example 11**Write the electron configurations for the following atoms. Noble gas abbreviations are okay for inner core electrons. a) F b) P c) Ti d) Cu**Example 12**State whether each of the following atoms is paramagnetic or diamagnetic: • N • Fe • Ca

More Related