Ununoctium

118

Uuo

(294)

  • Name: Ununoctium
  • Symbol: Uuo
  • Atomic number: 118
  • Atomic weight: (294)
  • CAS Registry ID: 54144-19-3
  • Group name: Noble gas
  • Period number: 7
  • Block: p-block
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Description

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.

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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.

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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
Name Ununoctium
Symbol Uuo
Number 118
Chemical series noble gases
Group 18
Period 7
Block p
Appearance unknown
Standard atomic weight (294) g·mol−1
Electron configuration unknown
Electrons per shell 2, 8, 18, 32, 32, 18, 8
Atomic properties
Crystal structure unknown
Oxidation states
Electronegativity
Ionization energies
(more)
(more)
Atomic radius
Atomic radius (calc.)
Covalent radius
Van der Waals radius
Physical properties
Phase presumed 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
CAS registry number 54144-19-3

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