In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

This element's only oxidation state is -1, and it is impossible to free from its compounds by chemical means. It is prepared commercially be the same method which Henri Moisson used to isolate it in 1886, and is also found in the mineral cryolite. Its only isotope is the stabe 19 version, and in its gaseous form takes on a pale yellow color. The most electronegative and reactive of the elements, FTP, what is this lightest of the halogens with atomic number 9 and symbol F
Science

Occlusion by this astronomical body of Saggitarius Tr-180 suggests that the rate of sublimation from its surface has doubled. That sublimation may have helped to create evaporite deposits such as the Akupara and Rem maculae, which cover a surface of beta-hexagonal ice surrounding the Plain of Abatus. Its changing albedo is believed to couple with gravitational diapirism to produce the cavi of its unique terrane of Bubeme. Perhaps the most interesting surface features occur in its equatorial region, which contains fault-block mountain ranges bounded by the Ho and Lo sulci, indicating a tectonic past, and the geyser plumes Hili and Mahilani, which contribute to its thin atmosphere. FTP, name this moon of Neptune best known for its cryovolcanic eruptions and its retrograde orbit.
Science

This deity rescued Aurvandil, or Earendil, from the frozen waste and made a star out of his toe; by reporting this, he disrupted the concentration of Aurvandil's wife, the witch Groa, in the middle of her incantations. This deity has a whetstone lodged in his head from his duel against the Mist Calf and the giant Hrungnir. This god kept the dwarf (*) Alvis awake until the sun turned him to stone. He took Thialfi as his servant after Thialfi ate one of the marrows of the goats that drive his chariot. This husband of Sif will kill and be killed by the World Serpent at Ragnarok. For 10 points, name this wielder of Mjollnir, the Norse god of thunder.

Social Science

