Is this a possible structural isomer for Butene(C4H8) Today in school, my teacher was explaining the different types of alkenes. Examples included ethene, propene, and butene.  She also showed us their structural formulas.
I tried to draw butene's formula and came up with this:



Is it correct?
Yes, the formula you drew is an example of isobutylene.  Isobutylene has the "official" IUPAC name of 2-methylpropene, and is an important industrial chemical.  Because it:


has a formula of $\ce{C4H8}$, and thus contains four carbon atoms;
contains a carbon-carbon double bond;
and doesn't contain any other functional groups


... it is indeed an isomer of butene (sometimes known as butylene).  You got this one right!$%edit$