Question

what is the molecular geometry of trans-difluroethylene: trans-C2H2F2?

i want to say it is a tetrahedral because it has four atoms and no lone pairs, but im not sure.

Answer 1

It looks to me like it has 6 atoms.

You might find the answer here:
http://books.google.com/books?id=FZEI7VmjNyMC&pg=PA40&lpg=PA40&dq=C2H2F2+structure&source=web&ots=uWcVc_FbaK&sig=005nNlOIG_29E6PFASdSM0xU_bo&hl=en

It does not look tetrahedral.

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