What structural feature is indicated by the suffix -ene in the name of a hydrocarbon
a double bond between carbon atoms
a ring of carbon atoms
a triple bond between carbon atoms
a branched carbon chain

A double bond between carbon atoms

Explanation:

The suffix -ene is used for alkenes, which tells you that the molecule has a carbon-carbon double bond.

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the atomic mass is the bottom number on the element.

-steel jelly