Element 113

Element 113, known as Nihonium (Nh), is a synthetic element in the periodic table with the atomic number 113. It's a highly radioactive element and is not found naturally. Nihonium was first reported by Russian scientists from the Joint Institute for Nuclear Research in Dubna, Russia, and later by scientists from the RIKEN collaboration in Japan. The discovery by the RIKEN team was officially recognized, leading to the element being named "Nihonium" in 2016, after "Nihon," one of the two ways to say "Japan" in Japanese.

Nihonium is part of the group known as the "superheavy" elements, located in the seventh period and group 13 of the periodic table. It's a post-transition metal, similar to thallium in its physical and chemical properties, although this is mostly theoretical due to the extremely short half-lives of nihonium isotopes, which limit experimental observation.

The most stable known isotope, nihonium-286, has a half-life of about 10 seconds, but the unconfirmed nihonium-290 may have a longer half-life of about 20 seconds. Due to its short half-life, nihonium does not have any known practical applications and is mainly used for scientific research purposes.