dangling bond


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dangling bond

[¦daŋ·gliŋ ′bänd]
(solid-state physics)
A chemical bond associated with an atom in the surface layer of a solid that does not join the atom with a second atom but extends in the direction of the solid's exterior.
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Ultimately, this leaves a more or less featureless surface on which the few remaining dangling bonds light up as beacons, since they have acquired a negative charge.
Dangling bonds stick up from the surface when sausage-like silicon crystals are sliced into wafers.
Thus, when 60 to 600 carbon atoms link up, the dangling bonds encourage the formation of hollow fullerenes, Kroto says.
These dangling bonds allow the electrons to return to their original state without emitting light, so the luminescence disappears, says Collins.