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Hydrogen fluoride does not boil until 20 °C in contrast to the heavier hydrogen halides, which boil between −85 °C (−120 °F) and −35 °C (−30 °F). [6] [7] [8] This hydrogen bonding between HF molecules gives rise to high viscosity in the liquid phase and lower than expected pressure in the gas phase.
In dilute aqueous solution hydrogen fluoride behaves as a weak acid, [10] Infrared spectroscopy has been used to show that, in solution, dissociation is accompanied by formation of the ion pair H 3 O + ·F −. [11] [12] H 2 O + HF ⇌ H 3 O + ⋅F − pK a = 3.17. This ion pair has been characterized in the crystalline state at very low ...
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
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Hydrogen fluoride, HF, a diatomic compound which can dissolve in water to form hydrofluoric acid, a highly corrosive solution Hydrofluoric acid , HF (aq) , a solution of hydrogen fluoride (HF) in water
In the periodic table image these elements are found on the right or upper side of the dashed line traversing the p-block. Ⓚ Of 103 elements shown in the image, just ten form anions, all of these being in the p-block: arsenic; the five chalcogens: oxygen, sulfur, selenium, tellurium, polonium; and the four halogens: fluorine, chlorine ...
Pnictogens (nitrogen's periodic table column) show very similar trends in reactivity and acidity of the highest fluorides (pentafluorides) and most common ones (trifluorides), with the said property increasing down the group: NF 3 is stable against hydrolysis, [84] PF 3 hydrolyzes very slowly in moist air, [85] while AsF 3 completely hydrolyzes ...
Blue type items have an article available by clicking on the name. Name Formula Boiling pt (°C) ... Hydrogen: H 2: −252.879 −259.16 2 ... Hydrogen fluoride: HF ...