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(C2H4, Ethene)
(compound of two carbon and four hydrogen atoms)

Ethylene (C2H4 or Ethene) is a compound of two Carbon and four Hydrogen atoms. The shape is an H, with two carbon atoms bound by a double bond, each with two hydrogen atoms hanging off. At atmospheric pressure and Temperature, it is a gas.

It has been observed in the Atmospheres of Neptune and Pluto.