113 in Chemistry
In chemistry, 113 is the atomic number of nihonium (Nh), a synthetic superheavy element in group 13, period 7 of the periodic table. It was first made at RIKEN in Japan in 2004 and named after Japan ("Nihon") in 2016. Separately, "mass 113" refers to isotopes such as indium-113 and cadmium-113.
Element 113 Guides
Element 113: Nihonium, Discovery & Name History
What element 113 is, who discovered it, when, the competing claim, and how it came to be named nihonium.
What Element Is 113 on the Periodic Table?
Nihonium's group, period, block, neighbours and electron configuration, with a group 13 comparison.
Nihonium Properties, Isotopes & Half-Lives
All known nihonium isotopes, decay chains, cold vs hot fusion, and predicted physical and chemical properties.
Atomic Mass 113: Indium-113 & Cadmium-113
Isotopes with mass number 113, why their mass is 112.904 u, and how mass number differs from atomic number.
113 Chemical Compounds
Compounds and molecules connected with the number 113.
Element 113 Quick Facts
- Name and symbol: nihonium, Nh (formerly ununtrium, Uut)
- Position: group 13, period 7, p-block, below thallium
- Discovered by: Kosuke Morita's team at RIKEN, Japan (first atom 23 July 2004)
- Officially credited: 30 December 2015; name approved 28 November 2016
- Longest-lived known isotope: nihonium-286, half-life roughly 10 seconds