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When we are determining if a given compound is aromatic using Hückel's rule, we count the number of delocalized $\pi$ electrons.

In tropone for example, if I wanted to count the number of delocalized $\pi$ electrons, should I count the $\pi$ electrons of the $\ce{C=O}$ bond?

Or is the aromaticity of tropone because we can draw a more stable aromatic resonating structure in which the $\ce{C}$ acquires a positive charge and the $\ce{O}$ a negative charge?

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