The electron shell of unhexoctium
Chemical properties
Name, symbol, number: unhexoctium, Uho, 168
Element category: unknown (possible noble gas or post-transition metal if according to the Pyykkö model)
Group, period, block: 18, 8, p
Standard atomic weight: [462][1]
Electron configuration: [Og] 6f147d108p6


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

Unhexoctium, also known as eka-oganesson or element 168, is the temporary name of a hypothetical superheavy chemical element in the periodic table that has the temporary symbol Uho and has the atomic number 168. In the periodic table of elements, it is a p-block element and the last one of the 8th period. As of 2012, no attempt has been made to synthesize this element. It is predicted to be a noble gas[3], but according to the Pyykkö model, unhexoctium is predicted to be a post-transition metal right below unquadnilium.


Currently, unhexoctium 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.


No name has yet been officially suggested for the element. According to current guidelines from IUPAC, the ultimate name for all new elements should end in "-ium", which means the name for unhexoctium may end in "-ium", not "-on", even if unhexoctium turns out to be a noble gas, which traditionally have names ending in "-on" (with the exception of helium, which was not known to be a noble gas when it was discovered).[4]


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