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Questions and Answers
Why does a sodium street lamp give off a yellow color, whereas a neon light gives off a red color?
Why does a sodium street lamp give off a yellow color, whereas a neon light gives off a red color?
Because the substances absorb and emit different wavelengths of light.
Describe the energy levels of electrons in an atom.
Describe the energy levels of electrons in an atom.
There are 7 energy levels with 1 being the closest to the nucleus and 7 being the furthest away. Energy level 1 has the least amount of energy while 7 has the most.
Why do some elements produce colorful flames?
Why do some elements produce colorful flames?
Because chemical elements have different emission spectra.
How can you identify an unknown element using a flame test?
How can you identify an unknown element using a flame test?
Write the electron configuration for lithium, sodium, and potassium.
Write the electron configuration for lithium, sodium, and potassium.
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Study Notes
Sodium vs Neon Light Emissions
- Sodium street lamps emit a yellow color due to the absorption and emission of specific wavelengths of light.
- Neon lights produce a red color because of a different set of wavelengths.
Electron Energy Levels
- There are seven principal energy levels (n=1 to n=7) within an atom.
- Energy level 1 is closest to the nucleus and has the lowest energy, while energy level 7 is farthest and possesses the highest energy.
Colorful Flames and Emission Spectra
- Different elements have unique emission spectra, which results in the production of various flame colors when heated.
Flame Test for Identifying Elements
- An unknown element can be identified by the specific color of flame it produces during a flame test.
Electron Configurations
- Lithium: 1s²2s¹
- Sodium: 1s²2s²2p⁶3s¹
- Potassium: 1s²2s²2p⁶3s²3p⁶4s¹
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