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Bifluoride
The bifluoride, or hydrogen(difluoride), ion is the species HF2 -. This centrosymmetric triatomic anion features the strongest known hydrogen bond, with an F - H length of 114 pm[1] and a bond strength of >155 kJ mol - 1.[2] A molecular orbital diagram reveals the atoms to be held together by a 3 - center 4 - electron bond.[3] Hydrogen(difluoride) is written as one word because it is an anion. Hydrogen difluoride would imply an electrically neutral compound, HF2, which does not exist
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