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Lewis Dot of the Dicarbide Ion (Acetylide Ion)

C22-

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From- http://en.wikipedia.org/wiki/Acetylide -Some salts of the C22− anion are traditionally called carbides, e.g. calcium carbide Ca2+ĚC22− and lithium carbide (Li+)2ĚC22−. Some acetylides are explosive, and their accidental formation is a major safety risk in acetylene processing or storage. Acetylides are very useful reagents in organic chemistry.

 

from  http://treefrog.fullerton.edu/chem/LS/C2neg2LS.html

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