It is known as ununbium (Uub), which is a synthetic and radioactive element. The element belongs to the group of transition metals and has a very short half-life.
Its discovery was the result of the successful collaboration between scientists from Russia, Germany, and the United States in 1996.
The discovery of Uub was a result of a series of experiments conducted by scientists from the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. In their experiment, they bombarded a target made of lead-208 with accelerated nuclei of zinc-70. After the collision, a single atom of ununbium was detected, which decayed quickly into lighter elements, emitting alpha particles.
The discovery of Uub was confirmed later in 2004 by the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, and the Lawrence Livermore National Laboratory (LLNL) in California, USA. The collaboration between the two laboratories helped to determine the atomic properties of Uub and its decay products.

Naming and Symbol
Initially, Uub was assigned the temporary name of ununbium (Uub), based on its atomic number. In 2016, the International Union of Pure and Applied Chemistry (IUPAC) officially approved the name copernicium (Cn) for element 112.
The name was given to honor the Polish astronomer Nicolaus Copernicus, who revolutionized our understanding of the solar system.
The symbol for copernicium is Cn, which replaces the previous temporary symbol, Uub.
Physical and Chemical Properties
Uub is a synthetic element that is not found in nature. It is created by nuclear fusion in a laboratory, where scientists bombard a heavy element with a beam of lighter nuclei. Uub has an atomic number of 112, which means it has 112 protons and 112 electrons.
Uub is a transition metal, which means it belongs to the same group as other metals such as copper, silver, and gold. Its atomic weight is 285 u, and it has a density of around 23.7 g/cm3. Uub has a melting point of around 357°C, which is relatively low compared to other transition metals.
Due to its short half-life, Uub is extremely unstable and decays quickly into lighter elements.