PFAS compounds (per- and polyfluoroalkyl substances) are, sadly, everywhere. Even in the blood of polar bear. Here is a short animated visualization showing the chemical structure of one of the really bad PFAS-compounds, namely PFOA (Perfluorooctanoic acid).The chemical bond between the carbon groups and the fluor groups is very strong and the reason for both the wanted (hydrophobic and lipophilic) and unwanted (very difficult to break down leading to bioaccumulation) effects of the PFOA-compounds.
3D-model from PubChem, animation by me (Moving Science).