114
  Uuq  
285.000000
Ununquadium

Name: Ununquadium
Symbol: Uuq
Atomic Number: 114
AtomicWeight: 285.000000
Family: Other Metals
CAS RN: 54085-16-4
Description: Unknown appearance, probably metallic solid.
State (25C): Unknown (Synthetic)
Oxidation states:
Valence Electrons: 5f146d107s27p2

Boiling Point:  unknown
Melting Point:
unknown
Electrons Energy Level: unknown
Isotopes: 5 + None Stable
Heat of Vaporization: unknown
Heat of Fusion: unknown
Density: unknown
Specific Heat: unknown
Atomic Radius: unknown
Ionic Radius: unknown
Electronegativity: unknown
Ununquadium: or eka-Lead, is the temporary name of a radioactive chemical element in the periodic table that has the temporary symbol Uuq and has the atomic number 114.

The discovery of ununquadium in December 1998 was reported in January 1999 by scientists at the Joint Insitute for Nuclear Research in Dubna, Russia. 

They bombarded atoms of Plutonium with ions of Calcium.  This produced a single atom of Ununquadium-289, an isotope with a half-life of about 21 seconds.   Ununquadium's most stable isotope, Ununquadium-289, has a half-life of about 21 seconds.  It decays into Ununbium-285 through alpha decay.

The same team produced another isotope of Uuq three months later and confirmed the synthesis in 2004 and 2006.

In 2004 in the Joint Institute for Nuclear Research the synthesis of this element was confirmed by another method (the chemical identifying on final products of decay of element).

Ununquadium is a temporary IUPAC systematic element name.  Some have termed it eka-lead, as its properties are conjectured to be similar to those of Lead.  It is expected to be a soft, dense metal that tarnishes in air, with a melting point around 200oCelsius.

6
C
12.02
14
Si
28.08
32
Ge
72.15
50
Sn
118.7
82
Pb
207.2
114
Uuq
285.0
1s2
2s2 2p6
3s2 3p6 3d10
4s2 4p6 4d10 4f14
5s2 5p6 5d10 5f14
6s2 6p6 6d10
7s2 7p2

Isotopes

Synthesis

Ununquadium can be synthesized by bombarding 244Pu targets with 48Ca heavy ion beams.

The results of calculations suggest that Ununquadium will not form a Tetrafluoride UuqF4, but could be isolated as a water-soluble Difluoride UuqF2.

Synthesis of Isotope 298

Manufacturing Ununquadium-298 would be very difficult, because nuclei summing to 114 protons and 184 neutrons are not available in weighable quantities.

However it may be possible to generate the isotope 298 of Element 114, if nuclear transfer reactions can be achieved.  One of these reactions may be:

204Hg + 136Xe rarrow.gif (63 bytes) 298Uuq + 40Ca + 2n

Stable Ununquadium

According to the Island of Stability Theory, some nuclides around the area of 114 protons and 184 neutrons (i.e. isotope Uuq-298) can be expected to be relatively stable in comparison to the surrounding nuclides.  Ununquadium does not occur naturally on the earth, so it is entirely synthesized in laboratories.  All isotopes of ununquadium synthesized so far are neutron-poor.  This means that they contain significantly fewer neutrons than 184, which is one of the magic number of neutrons that is believed to make the isotope more stable.  Neutron-poor also indicates that the isotopes decay either by spontaneous fission producing a variety of radionuclides, positron emission or Electron capture to yield element ununtrium.

Isotope  
Atomic Mass
 
Half-Life
285Uuq 285.18370 ~5 seconds
286Uuq 286.18386 0.16 ms
287Uuq 287.18560 0.51 seconds
288Uuq 288.18569 2.8 seconds
289Uuq 289.18728 2.6 seconds