A Review of Perfluoroalkyl Acids (PFAAs) in terms of Sources, Applications, Human Exposure, Dietary Intake, Toxicity, Legal Regulation, and Methods of Determination

Table 1

Atomic characteristics of fluorine and hydrogen.

Parameter	Fluorine	Hydrogen
Ionization potential (kJ·mol^−1)	1676	1312
Electron affinity (kJ·mol^−1)	328	72.8
Electronegativity (Pauling units)	3.98	2.20
Polarizability α (10^−24 cm^3)	0.557	0.667