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118 Uuo (294)

Ununoctium

Noble gas
Symbol Uuo
Atomic Number 118
Atomic Weight (294)
CAS Registry ID 54144-19-3
Group Name Noble gas
Period Number 7
Block p-block
State at STP Solid

Description

Sample of Ununoctium โŒ• Enlarge Image

Ununoctium is the name for an element that has been very briefly detected just recently. It is a transuranic element, a super-heavy element, and is predicted to have an atomic weight of 314. It is thought that ununoctium is a noble gas that is probably colorless in its appearance. From the brief moments that it was detected, it is assumed that ununoctium has chemical characteristics similar to radon; for this reason it is sometimes referred to as eka-radon. Not much else is known about this element.

Isolation

Ununoctium does not exist in nature in any form. This element can only be synthesized for very brief periods of times using specialized equipment and procedures.

Ununoctium โŒ• Enlarge Image

The isotope of ununoctium was first detected in 2006 during the synthesis of ununhexium. During this time, three nuclei of ununoctium appeared before they quickly decayed. The procedure that was used consisted of using californium and calcium isotopes. During the reaction, the calcium isotope, number 48, was used to bombard a target of the californium isotope, number 249, in order to produce ununhexium. Before ununhexium was produced in its isotopic form, the isotope of ununoctium briefly appeared. The ununoctium then underwent alpha decay to produce the ununhexium. The reaction proceeded very quickly as the half life of the ununoctium isotope was estimated to be only 0.89 milliseconds. Verification of the ununoctium nuclei that were produced was conducted through the creation of a putative daughter nucleus of an isotope of ununhexium. A claim of ununoctium production using krypton and lead that was released in 1999 was later proved to be fraudulent.

General

NameUnunoctium
SymbolUuo
Number118
Chemical seriesNoble gas
Group18
Period7
Blockp
Appearanceunknown
Standard atomic weight(294) gยทmolโปยน
Electron configurationunknown
Electrons per shell2, 8, 18, 32, 32, 18, 8

Atomic Properties

Crystal structureunknown
Oxidation states
Electronegativity
Ionization energies
Atomic radius
Atomic radius (calc.)
Covalent radius
Van der Waals radius

Physical Properties

Phasepresumed gas
Density (near r.t.)
Liquid density at m.p.
Melting point
Boiling point
Critical point
Heat of fusion
Heat of vaporization
Heat capacity

Miscellaneous

Magnetic ordering
Electrical resistivity
Thermal conductivity
Thermal expansion
Speed of sound (thin rod)
Young's modulus
Shear modulus
Bulk modulus
Poisson ratio
Mohs hardness
Vickers hardness
Brinell hardness