What is Nihonium
Nihonium (pronunciation nee-hone-ee-em ), represented by the chemical symbol Nh, is a synthetic, radioactive, transuranium metal [1, 10, 11]. Of its two known isotopes, Nh 284 and Nh 286 , the latter is more stable with a half-life of 20 seconds .
Where Is It Found
The super heavy element cannot be found naturally on earth. A tiny amount has been synthesized in labs [1, 3].
Origin of Its Name: It is named after the Japanese name for Japan .
Who Discovered It: Scientists from The Institute of Physical and Chemical Research (RIKEN) in Japan .
How Was Nihonium Discovered
The first two atoms of the element were produced on July 23, 2004, at RIKEN by accelerating zinc ions to make them reach 10% of the speed of light and then allowing them to strike a bismuth target. The atoms were of nihonium 278 that quickly underwent alpha decay to dubnium 262 [2, 3].
|Atomic Number||113 |
|CAS Number||54084-70-7 |
|Position in the periodic table||Group||Period||Block|
|13 ||7 ||p |
Properties and Characteristics of Nihonium
|Atomic mass||286 atomic mass units |
|Atomic weight||286 |
|Melting point/freezing point||Unknown |
|Boiling point||Unknown |
|State of matter at room temperature (normal phase)||Solid (estimated) [1,3]|
|Oxidation states||Unknown |
Atomic Data of Nihonium (Element 113)
|Valence electrons||7s27p1  (as predicted depending on its position in periodic table)|
|Electron configuration (noble gas configuration)||[Rn] 5f146d107s27p1 |
|– Number of Electrons||113 |
|– Number of Neutrons||113 |
|– Number of Protons||173 |
|Energy levels |
|– First Energy Level||2|
|– Second Energy Level||8|
|– Third Energy Level||18|
|– Fourth Energy Level||32|
|– Fifth Energy Level||32|
|– Sixth Energy Level||18|
|– Seventh Energy Level||3|
|Radius of atom|
|– Atomic Radius||Unknown |
|– Covalent Radius||1.36 Å |
The minuscule amount of production of the metal restricts its use to research purposes only .
Is It Dangerous
The highly radioactive nature makes it potentially harmful [1, 3].
- It was temporarily given the name ununtrium (symbol Uut ) representing its atomic number before being officially named by IUPAC on 28th November 2016 along with moscovium, tenessine and oganesson [6, 7].
- The name Japonium was considered for the element by the researchers to emphasize the Japan connection, but the proposal was dismissed since the word Jap is insulting to the Japanese .
Nihonium (Ununtrium) Cost
Unknown as it is not available commercially .