Answer:
Here's what I find.
Explanation:
I get the five resonance contributors shown below.
Except for the bottom structure, the S atom always has a + charge and the C atoms have a negative charge.
The resonance hybrid has six π electrons, so thiophene is aromatic.
Note that only one of the lone pairs on S is involved in the resonance system.
The other lone pair is in an sp² orbital, which is in the plane of the ring and therefore cannot participate in resonance.
