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.

The electron dipole moment of this particle is at most three times ten to the negative 26th, and would violate CPT-symmetry if it is non-zero. This particle has a half-life of 881 seconds, and can break up into a proton, an electron and an electron antineutrino via beta decay. This particle is composed of one (*) up and two down quarks, and nuclear fission is initiated by the bombardment of this particle. The number of this particle dictates what isotope an atom is, and they have mass roughly equal to that of a proton. James Chadwick discovered, for ten points, what particle found in the nucleus, which, as its name suggests, has a net charge of zero
Science

One description of the court of this leader is a History written in Greek by Priscus of Panium. A policy of appeasement was unsuccessfully used by Theodosius II to try and stop this ruler from invading his empire. This man fought a battle against forces under Theodoric I and Aetius on the Catalaunian Plains. This loser of the Battle of Chalons became sole ruler of his people after he arranged the murder of his brother Bleda. For 10 points, name this ruler who gained the title ""Scourge of God"" for his invasions into the Roman Empire while leader of the Huns.
History

During the reign of one of this politys kings, the royal cult of Zomadonou was consecrated; that king, Tegbessou, also mutilated the corpses of the Zou people he defeated. Another king, Adandozan, was overthrown by his brother Gezo, who was succeeded by his son Glele. One reform introduced by its third king was a ruling regnum formed by the king and the kpojito, or wife of the leopard, a common woman. That king negotiated a tribute paid by this polity to the kingdom of Oyo and conquered such nearby states as Whydah, Alladah, and Savi. During his conquest of Savi, this kingdoms namesake Amazons were first deployed. FTP, identify this West African Fon kingdom which had its capital at Agbome, and which became the modern state of Benin.

History