Ununquadium

114 ununtrium ← ununquadium → ununpentium Pb ↑ Uuq ↓ (Uhq) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	ununquadium, Uuq, 114
Chemical series	presumably poor metals
Group, Period, Block	14, 7, p
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(298) g/mol
Electron configuration	perhaps [Rn] 5f14 6d10 7s2 7p2 (guess based on lead)
Electrons per shell	2, 8, 18, 32, 32, 18, 4
Phase	presumably a solid
CAS registry number	54085-16-4
References

Ununquadium (IPA: /ˌjuːˌnʌnˈkwɒdiəm/), 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.

History

The discovery of ununquadium in December 1998 was reported in January 1999 by scientists at Dubna (Joint Institute for Nuclear Research) in Russia.^[1] The same team produced another isotope of Uuq three months later^[2] 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 200 degrees Celsius.

Synthesis

Ununquadium can be synthesized by bombarding plutonium 244 targets with calcium 48 heavy ion beams.

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.^{[citation needed]} One of these reactions may be: ²⁰⁴Hg + ¹³⁶Xe → ²⁹⁸Uuq + ⁴⁰Ca + 2n

(more) 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.

See also

• Isotopes of ununquadium
• Island of stability: Ununquadium – Unbinilium – Unbihexium
• Lead
• Eka-thallium — Eka-lead (this element) — Eka-bismuth
• Ununtrium – Ununpentium
• Periodic table (extended)

References

1. ↑ Oganessian, Yu. Ts., et al. (October 1999). "Synthesis of Superheavy Nuclei in the ⁴⁸Ca + ²⁴⁴Pu Reaction". Physical Review Letters 83: 3154. DOI:10.1103/PhysRevLett.83.3154.
2. ↑ Oganessian, et al. (July 1999). "Synthesis of nuclei of the superheavy element 114 in reactions induced by ⁴⁸Ca". Nature 400: 242. DOI:10.1038/22281.

External links

• WebElements.com - Uuq
• Apsidium - Ununquadium
• First postcard from the island of nuclear stability
• Second postcard from the island of stability