Custom Search Lewis Dot of Ethyne (Acetylene) C2H2 Since all the atoms are in either period 1 or 2, this molecule will adhere to the octet rule. The exception, of course, being the hydrogen's. They follow the duet rule (2 electrons). Acetylene is an unsaturated hydrocarbon with a triple bond. Used in oxy-acetylene torches used for welding.
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