Name: Mods: UNIT 4 - Electron Configuration Date Agenda Homework Wed 10/29 Thurs 10/30 Fri 10/31 Mon 11/3 Tues 11/4 Wed 11/5 Go over test PPT Notes - Wavelength and Frequency (slides 1-9) Go over Worksheet #1 PPT Notes - Wavelength, Frequency and Energy (slides 10-12) Start Worksheet #2 PPT Notes Spectroscopy (slides 13-15) Activity Spectroscopy (page 4-6 in packet) Go over Spectroscopy Activity questions Quiz - Wavelength and Frequency PPT Notes - Electron Configuration Hotel (slides 16-26) Go over HW Electron Configuration Worksheet #3 Thurs 11/6- Fri 11/7 Read pgs 372-375 Worksheet #1 Read pgs 376-377 Worksheet #2 Finish Spectroscopy Activity Quiz tomorrow Wavelength and Frequency Read pgs 361-366 Problems pg 386, # 33 and 45 Read 367-370 Finish Worksheet #3 (page 7-8) No School NJEA Convention Mon 11/10 Tues 11/11 Wed 11/12 (1/2 Day) Thurs 11/13 PPT Notes Shorthand Electron Configuration and Periodic Table Trends (slides 29-36) Worksheet #4 (pages 9-11) Go over Worksheet #4 Start working on Review Worksheet #5 (pg 12-14) Review for test go over any questions Test - Electron Configuration Finish Worksheet #4 Review Worksheet #5 Study for test 1
Worksheet #1: Wavelength and Frequency Problems 1. The brilliant red colors seen in fireworks are due to the emission of light with wavelengths around 650 nm when strontium salts are heated. Calculate the frequency of red light of wavelength 6.50 x 10 2 nm. 2. The blue color in fireworks is often achieved by heating copper (I) chloride to 1200 o C. Then the compound emits blue light having a wavelength of 450 nm. What is the quantum of energy that is emitted at 4.50 x 10 2 nm by copper (I) chloride? 3. Calculate the wavelength of yellow light emitted by a sodium lamp if the frequency of the radiation is 5.10 x 10 14 Hz. 4. What is the wavelength of radiation with a frequency of 1.50 x 10 14 s -1? Does this radiation have a longer or shorter wavelength than red light? 5. What frequency is radiation with a wavelength of 5.00 x 10-6 cm? In what region of the electromagnetic spectrum is this radiation? 2
Worksheet #2: Frequency, Wavelength and Energy Problems 1. Calculate the energy (in J) of a quantum of radiant energy (the energy of a photon) with a frequency of 5.00 x 10 15 s -1. 2. What is the energy of a photon of microwave radiation with a frequency of 3.20 x 10 11 s -1? 3. Calculate the energy of a photon produced by light of a wavelength of 260 nm. (hint: you need to calculate frequency first!) 4. What is the energy of a photon of green light with a frequency of 5.80 x 10 14 s -1 5. Calculate the energy of a photon of red light with a wavelength of 6.45 x 10-5 cm. Compare your answer with the answer in problem 4. Is red light of high or lower energy than green light? 3
Spectroscopy Activity INTRODUCTION: Remember, we did flame tests already during the ions portion of the last unit. Flame tests provide a way to qualitatively test for the presence of specific metallic ions. The heat of a flame excites the electrons in the metal ion, and this energy is released as the electrons fall back to their ground states. We will now connect the flame tests to this concept of wavelength that we have been working on. The color we see is a combination of visible wavelengths of light emitted by the ion. OBJECTIVE: Understand the connection between wavelength and the visible light spectrum. PROCEDURE: 1. Use a spectroscope to identify the line spectrum for a gas sample. 2. Record the colors in the line spectrum. 3. Repeat for each of the gas samples. 4. Identify the unknown gas sample. 4
Flame Test refer back to your composition notebook for the flame colors Element: Strontium Flame Color: Primary Wavelength: 650 nm Calculate Frequency: Calculate the quantum of radiant energy (energy of a photon) Element: Sodium Flame Color: Primary Wavelength: 550 nm Calculate Frequency: Calculate the quantum of radiant energy (energy of a photon) 5
Element: Copper Flame Color: Primary Wavelength: 500 nm Calculate Frequency: Calculate the quantum of radiant energy (energy of a photon) Element: Barium Flame Color: Primary Wavelength: 610 nm Calculate Frequency: Calculate the quantum of radiant energy (energy of a photon) 6
Worksheet #3: Electron Configuration Complete the following chart: Element Atomic Number Electron Configuration Number of Valence Electrons Dot Diagram Number electrons probably lost or gained Charge on ion O 8 1s 2 2s 2 2p 4 Gain 2-2 Na 11 1s 2 2s 2 2p 4 3s 1 Lose 1 +1 S K Al Cl 7
Element Atomic Number Electron Configuration Number of Valence Electrons Dot Diagram Number electrons probably lost or gained Charge on ion Xe Ca F Br N Ar I Sr 8
Worksheet #4: ELECTRON CONFIGURATION Fill in the following chart Name Shorthand Configuration Dot diagram Possible charge on ion Lithium Potassium Magnesium Strontium Zinc Copper Silver Iron Boron 9
(Worksheet #4, con) Name Shorthand Configuration Dot diagram Possible charge on ion Aluminum Carbon Silicon Phosphorus Arsenic Oxygen Sulfur Chlorine Iodine Helium Krypton 10
(Worksheet #4, con) Place the ending configuration and the dot diagram for the above elements in the appropriate place on the table below. Describe a minimum of two patterns that you observe. 11
Review: Worksheet #5 1. Calculate the frequency with a wavelength of 550 nm 2. Calculate the energy associated with a frequency of 2.5 x 10 14 Hz 3. Draw the atomic orbital filling tree showing the order in which atomic orbitals are filled: 4. Use the orbital filling tree to write the electron configuration for iodine: 5. Use the orbital filling tree to write the electron configuration for gold: 6. Use the orbital filling tree to write the electron configuration for calcium: 12
7. Using the periodic table, write the shorthand electron configuration for the following: a. Sodium b. Strontium c. Iron d. Aluminum e. Sulfur f. Chlorine 8. Identify the following elements: a) 3s 2 b) 4s 1 c) 4d 10 d) 1s 2 e) 2p 5 f) 4d 2 9. From the following orbital notations, answer the following questions. a. b. c. _ _ d. e. 1. Which of the above can be found in column 8? 2. Which would have the most common charge of +2? 3. Which would have the most common charge of 3? 4. Which could be the valence electrons for sulfur? 5. Which could be the valence electrons for helium? 6. Which has the greatest number of partially filled p orbitals? 7. Which has no filled p orbitals? 8. Which would not react? 9. Which would be in group 3? 13
10. Draw the orbital notation (arrows) for the following: a. Fluorine: b. Calcium c. Helium 14