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single bond vs. double bond

noun
  1. a chemical linkage consisting of one covalent bond between two atoms of a molecule, represented in chemical formulas by one line or two vertical dots, as C–H or C:H.
noun
  1. a chemical linkage consisting of two covalent bonds between two atoms of a molecule, represented in chemical formulas by two lines, two dots, or four dots, as CH2=CH2; CH2:CH2; CH2::CH2.