What is Hg2N2? Important knowledge about Hg2N2.

1. Definition of Hg₂N₂
   Hg₂N₂, also known as Millon’s Base, is an organic substance belonging to the amide group. In English, it is called Mercury nitride. This compound consists of two mercury atoms (Hg) and two nitrogen atoms (N), with an atomic mass of 452.63 g/mol. In terms of its molecular structure, it consists of two mercury atoms linked together through a nitrogen atom, forming a shape similar to a rhombus.
2. Properties of Hg₂N₂
   Hg₂N₂ exists in the form of odorless gray or black powder. This substance does not dissolve in water and does not have a specific pH value. In terms of chemical properties, Hg₂N₂ is rather stable but decomposes easily when exposed to strong light.
3. Common chemical reactions of Hg₂N₂
   Hg₂N₂ typically does not participate in common chemical reactions with metals, acids, non-metals, or salts.
4. Synthesis of Hg₂N₂
   Hg₂N₂ is not commonly used in chemical laboratories. However, it can be synthesized through the reaction between mercury and ammonia. Specifically, when mercury is dissolved in an ammonia solution, it forms an unstable compound, Hg₂N₂, while emitting steam.

Thus, Hg₂N₂ is a unique and rare chemical compound in nature. Although it is not widely used, understanding it is still very important for chemistry students.