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\nF Centres and the Yellow Colour of NaCl - Colour Hint\n

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\nNaCl, a perfect ionic crystal, has an alternating pattern of Na+ cations and Cl- anions. When heated, some Cl- anions can be lost, leaving anionic vacancies. These vacancies are occupied by electrons, creating F-centers, which are...\nNaCl, a perfect ionic crystal, has an alternating pattern of Na+ cations and Cl- anions. When heated, some Cl- anions can be lost, leaving anionic vacancies. These vacancies are occupied by electrons, creating F-centers, which are electrons trapped in an anionic vacancy. These F-centers create a localized electronic state within the band gap of the NaCl crystal. The F-centers have an optical absorption band in the blue-green region of the visible spectrum. When white light passes through the NaCl crystal containing F-centers, blue-green wavelengths are preferentially absorbed, while remaining yellow wavelengths are transmitted. This selective absorption of blue-green light gives the NaCl crystal a yellow appearance, ranging from pale yellow to deep orange, depending on the concentration of F-centers\n
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Media Length
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2:58
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Grade
9th - Higher Ed
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Subjects
Science
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Media Type
Instructional Videos
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Source:
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\nAudio Visual Representation of Chemistry\n\n
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Date
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2024
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Language
English
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For Teacher Use
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Fine Print: Educational Use
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Concepts

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electrons, center, white light, concentration
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nacl, perfect ionic crystal, na+ cations, cl- anions, heating, anionic vacancies, f-centers, localized electronic state, band gap, optical absorption band, blue-green region, visible spectrum, selective absorption, yellow appearance, pale yellow, deep orange, sodium ion, chloride ion, anion vacancy, unpaid electron, yellow light, diffuses, deposited, surface, form, shown, solid, occupies, crystal, excited
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