目前发现 的第一百一十四号元素

Ununquadium（Uuq)是原子序为114的化学元素的临时名称。

至今人们观测到约80条Uuq的衰变链，其中50个原子是直接合成的，其余30个是作为更重元素（Uuh和Uuo）的衰变产物被观测到的。所有衰变都来自Uuq一共5个相邻同位素。已知寿命最长的同位素为Uuq，半衰期约为2.6秒，但有证据显示存在着另一个核异构体Uuq，其半衰期约为66秒，并会是超重元素中寿命最长的原子核。

于2007年进行的化学研究指出Uuq的化学特性和铅的非常不同，并由于一些相对论性效应，它是第一个表现出惰性气体特性的超重元素。

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 → 298Unq + 40Ca + 2n

Uuq是一种人工合成的放射性化学元素，它的化学符号是Uuq，它的原子序数是114，属于弱金属之一。

Uuq在1998年合成于杜布纳，用钙轰击钚获得289Uuq，是迄今为止已知的最稳定同位素，半衰期达30秒，相比之下，是超铀元素中异乎寻常的长寿核素，似乎正在证实稳定岛理论的预言。