The electron shell of unhexennium
Chemical properties
Name, symbol, number: unseptnilium, Usn, 170
Element category: unknown (possible alkali metal)
Group, period, block: 2, 9, s
Standard atomic weight: [469][1]
Electron configuration: [Uho] 9s2


Phase: Unknown
Density (near r.t.): Unknown
Melting point: Unknown
Boiling point: Unknown
Oxidation states: Unknown
Atomic radius: Unknown
Discoverer None of as yet
Location discovered None of as yet
Date discovered None of as yet

Unseptnilium, also known as eka-unbinilium or element 170, is the temporary name of a hypothetical superheavy chemical element in the periodic table that has the temporary symbol Usn and has the atomic number 170. In the periodic table of elements, it is a s-block element and the second one of the 9th period. As of 2012, no attempt has been made to synthesize this element. It is predicted to be an alkaline earth metal.


Currently, unseptnilium goes under a systematic temporary element name. Since it is very far in the periodic table and has never been synthesized, very little is known about this element, and it is unknown whether a superheavy element like this could physically exist.

Extrapolated chemical propertiesEdit

Unseptnilium is a superheavy element, therefore it has a very large atom which is significantly radioactive. Since it is very far in the periodic table and has never been synthesized, very little is known about this element.

Taking the position in the periodic table as an alkali metal, it is predicted to be a heavier homologue to the lighter ones.


Unseptnilium is a temporary IUPAC systematic element name derived from the digits 170. Research scientists usually refer to the element simply as element 170.


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