L06_Electron_Configuration 2

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©eScience Labs, LLC 2015 Electron Configuration PRE-LAB QUESTIONS 1. What is an electron configuration? An electron configuration is the arrangement of electrons in orbitals around an atom nucleus. 2. How is the light emitted by an atom related to its electron configuration? Light is emitted when an electron jumps from a higher orbit to a lower orbit. The difference between the past and current orbital energy determines the energy and frequency of the light.
©eScience Labs, LLC 2015 Electron Configuration EXPERIMENT 1: THE CHEMISTRY OF FIREWORKS Data Sheet Table 3: Results of Firework Material Ignition Substance Observations Lithium chloride (LiCl) Burned reddish pink in in color and fizzled at first Sodium chloride (NaCl) Burned yellowish orange in color Potassium chloride (KCl) Burned blue in color Calcium chloride (CaCl 2 ) Burned bright orange and fizzled then combusted Table 4: Electron Configuration Element Electron Configuration K 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 Li 1s 2 2s 1 Na 1s 2 2s 2 2p 6 3s 1 Ca 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2
©eScience Labs, LLC 2015 Electron Configuration Table 5: Color of Light Emitted by Salt Types Salt Color Wavelength LiCl Reddish Pink 650 to 750nm NaCl Yellowish orange 580 to 595nm KCl Blue 435 to 480nm CaCl 2 Orange 595 to 650nm Post-Lab Questions 1. Write out the electron configurations of carbon and each of the metals of the salt compounds used. Record this in Table 4. Potassium is already done as an example for you. Hint : The periodic table is very helpful and can be used as a guide. 2. Identify the color emitted by each of the salts along with the corresponding approximate wavelength using Table 2 in the Introduction. Record your results in Table 5. 3. Why does a salt compound give off light (or a colored flame) when burned? The electrons in the salts are excited by the heat of the flame and release energy in different wavelengths as they return to their ground state. 4. Barium chloride (BaCl 2 ) emits a green color when flame-tested. What can be said about the wavelength of light it emits? Barium chloride burns a in a green flame and the wavelength for the color green is in the 500-560nm range.
©eScience Labs, LLC 2015 Electron Configuration
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