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{{Infobox element
|name = ununquadium
|symbol = Uuq
|left = [[ununtrium]]
|right = [[ununpentium]]
|above = [[Lead|Pb]]
|below = —
|atomic-number = 114
|configuration = [Rn] 7s<sup>2</sup> 5f<sup>14</sup> 6d<sup>10</sup> 7p<sup>2</sup>
|CAS-number = 54085-16-4
}}
'''Ununquadium''' (symbol: '''Uuq''') is a [[chemical element]] in [[group 14]] of the [[periodic table]]. It has attracted interest because of the possibility that <sup>298</sup>Uuq might be at the centre of a (relative) "[[island of stability]]" among superheavy nuclides<ref>{{citation | journal = Nucl. Phys. A | volume = 131 | issue = 1 | year = 1969 | pages = 1–66 | doi = 10.1016/0375-9474(69)90809-4 | title = On the nuclear structure and stability of heavy and superheavy elements | first1 = Sven Gösta | last1 = Nilsson | first2 = Chin Fu | last2 = Tsang | first3 = Adam | last3 = Sobiczewski | first4 = Zdzislaw | last4 = Szymański | first5 = Slawomir | last5 = Wycech | first6 = Christer | last6 = Gustafson | first7 = Inger-Lena | last7 = Lamm | first8 = Peter | last8 = Möller | first9 = Björn | last9 = Nilsson}}.</ref> and because the chemical properties of ununquadium might resemble those of the [[noble gas]]es rather than other group&nbsp;14 elements.<ref>{{citation | journal = J. Chem. Phys. | volume = 63 | pages = 1032–33 | year = 1975 | doi = 10.1063/1.431398 | title = Are elements 112, 114, and 118 relatively inert gases? | first = Kenneth S. | last = Pitzer | authorlink = Kenneth Pitzer}}.</ref>

The preparation of ununquadium was claimed in 1999 by the team of Oganessian ''et al.'' at Dubna in Russia:<ref name="Og99">{{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = A. V. | last2 = Yeremin | first3 = A. G. | last3 = Popeko | first4 = S. L. | last4 = Bogomolov | first5 = G. V. | last5 = Buklanov | first6 = M. L. | last6 = Chelnokov | first7 = V. I. | last7 = Chepigin | first8 = B. N. | last8 = Gikal | first9 = V. A. | last9 = Gorshkov | first10 = G. G. | last10 = Gulbekian | first11 = M. G. | last11 = Itkis | first12 = A. P. | last12 = Kabachenko | first13 = A. Yu. | last13 = Lavrentev | first14 = O. N. | last14 = Malyshev | first15 = J. | last15 = Rohac | first16 = R. N. | last16 = Sagaidak | first17 = S. | last17 = Hofmann | first18 = S. | last18 = Saro | first19 = G. | last19 = Giardina | first20 = K. | last20 = Morita | title = Synthesis of nuclei of the superheavy element 114 in reactions induced by <sup>48</sup>Ca | journal = Nature | volume = 400 | pages = 242–45 | year = 1999}}. {{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 =  Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = O. V. | last15 = Ivanov | first16 = G. V. | last16 = Buklanov | first17 = K. | last17 = Subotic | first18 = M. G. | last18 = Itkis | first19 = K. J. | last19 = Moody | first20 = J. F. | last20 = Wild | first21 = N. J. | last21 = Stoyer | first22 = M. A. | last22 = Stoyer | first23 = R. W. | last23 = Lougheed | title = Synthesis of superheavy nuclei in the <sup>48</sup>Ca&nbsp;+&nbsp;<sup>244</sup>Pu reaction | journal = Phys. Rev. Lett. | volume = 83 | pages = 3154–57 | year = 1999}}.</ref> these claims, and later results by the same team,<ref name="Og00">{{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 = Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = O. V. | last15 = Ivanov | first16 = G. V. | last16 = Buklanov | first17 = K. | last17 = Subotic | first18 = M. G. | last18 = Itkis | first19 = K. J. | last19 = Moody | first20 = J. F. | last20 = Wild | first21 = N. J. | last21 = Stoyer | first22 = M. A. | last22 = Stoyer | first23 = R. W. | last23 = Lougheed | title = Synthesis of superheavy nuclei in the <sup>48</sup>Ca&nbsp;+&nbsp;<sup>244</sup>Pu reaction | journal = Phys. Rev. C | volume = 62 | pages = 041604/1–041604/4 | year = 2000}}. {{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 = Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = O. V. | last15 = Ivanov | first16 = G. V. | last16 = Buklanov | first17 = K. | last17 = Subotic | first18 = M. G. | last18 = Itkis | first19 = K. J. | last19 = Moody | first20 = J. F. | last20 = Wild | first21 = N. J. | last21 = Stoyer | first22 = M. A. | last22 = Stoyer | first23 = R. W. | last23 = Lougheed | title = Synthesis of heavy nuclei in <sup>48</sup>Ca&nbsp;+&nbsp;<sup>244</sup>Pu interactions | journal = Phys. Atom. Nucl. | volume = 63 | pages = 1679–87 | year = 2000}}. {{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = K. J. | last3 = Moody. | journal = Phys. Atom. Nucl. | volume = 64 | pages = 1349 | year = 2001}}. {{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 = Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = O. V. | last15 = Ivanov | first16 = G. V. | last16 = Buklanov | first17 = K. | last17 = Subotic | first18 = M. G. | last18 = Itkis | first19 = K. J. | last19 = Moody | first20 = J. F. | last20 = Wild | first21 = N. J. | last21 = Stoyer | first22 = M. A. | last22 = Stoyer | first23 = R. W. | last23 = Lougheed | first24 = C. A. | last24 = Laue | first25 = Ye. A. | last25 = Karelin | first26 = A. N. | last26 = Tatarinov | journal = Phys. Rev. C | volume = 63 | page = 011301 | year = 2001}}.</ref><ref name="Og03">{{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 = Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = O. V. | last15 = Ivanov | first16 = G. V. | last16 = Buklanov | first17 = K. | last17 = Subotic | first18 = M. G. | last18 = Itkis | first19 = K. J. | last19 = Moody | first20 = J. F. | last20 = Wild | first21 = N. J. | last21 = Stoyer | first22 = M. A. | last22 = Stoyer | first23 = D. A. | last23 = Shaughnessy | first24 = J. M. | last24 = Kenneally | first25 = R. W. | last25 = Lougheed | journal = Phys. Rev. C | volume = 69 | page = 054607 | year = 2004}}.</ref><ref name="Og04">{{citation | first1 = Yu. Ts. | last1 = Oganessian | authorlink1 = Yuri Oganessian | first2 = V. K. | last2 = Utyonkov | first3 = Yu. V. | last3 = Lobanov | first4 = F. Sh. | last4 = Abdullin | first5 = A. N. | last5 = Polyakov | first6 = I. V. | last6 = Shirokovsky | first7 = Yu. S. | last7 = Tsyganov | first8 = G. G. | last8 = Gulbekian | first9 = S. L. | last9 = Bogomolov | first10 = B. N. | last10 = Gikal | first11 = A. N. | last11 = Mezentsev | first12 = S. | last12 = Iliev | first13 = V. G. | last13 = Subbotin | first14 = A. M. | last14 = Sukhov | first15 = A. A. | last15 = Voinov | first16 = G. V. | last16 = Bogomolov | first17 = K. | last17 = Subotic | first18 = V. I. | last18 = Zagrebaev | first19 = M. G. | last19 = Itkis | first20 = J. B. | last20 = Patin | first21 = K. J. | last21 = Moody | first22 = J. F. | last22 = Wild | first23 = M. A. | last23 = Stoyer | first24 = N. J. | last24 = Stoyer | first25 = D. A. | last25 = Shaughnessy | first26 = J. M. | last26 = Kenneally | first27 = P. A. | last27 = Wilk | first28 = R. W. | last28 = Lougheed | first29 = R. I. | last29 = Il’kaev | first30 = S. P. | last30 = Vesnovskii | journal = Phys. Rev. C | volume = 70 | page = 064609 | year = 2004}}.</ref> are under consideration by the [[IUPAC/IUPAP Joint Working Party on Discovery of Elements]] (JWP).<ref name="JWP03">{{citation | first1 = P. J. | last1 = Karol | first2 = H. | last2 = Nakahara | first3 = B. W. | last3 = Petley | first4 = E. | last4 = Vogt | title = On the Claims for Discovery of Elements 110, 111, 112, 114, 116, and 118 (IUPAC Technical Report) | journal = Pure Appl. Chem. | year = 2003 | volume = 75 | issue = 10 | pages = 1601–11 | doi = 10.1351/pac200375101601}}.</ref><ref name="JWP09">{{citation | journal = Pure Appl. Chem. | year = 2009 | volume = 81 | issue = 7 | pages = 1331–43 | doi = 10.1351/PAC-REP-08-03-05 | title = Discovery of the element with atomic number 112 (IUPAC Technical Report) | first1 = Robert C. | last1 = Barber | first2 = Heinz W. | last2 = Gäggeler | first3 = Paul J. | last3 = Karol | first4 = Hiromichi | last4 = Nakahara | first5 = Emanuele | last5 = Vardaci | first6 = Erich | last6 = Vogt}}.</ref>

==References==
{{reflist}}

===Further reading===
*{{citation | title = The Stability of the Oxidation State +4 in Group 14 Compounds from Carbon to Element 114 | first1 = Michael | last1 = Seth | first2 = Knut | last2 = Faegri | first3 = Peter | last3 = Schwerdtfeger | journal = Angew. Chem. Intl. Ed. | year = 1998 | volume = 37 | issue = 18 | pages = 2493–96 | doi = 10.1002/(SICI)1521-3773(19981002)37:18<2493::AID-ANIE2493>3.0.CO;2-F}}.
*{{citation | journal = J. Chem. Phys. | volume = 114 | pages = 2977 | year = 2001 | doi = 10.1063/1.1342763 | title = Electronic structure of eka-lead (element 114) compared with lead | first1 = Arie | last1 = Landau | first2 = Ephraim | last2 = Eliav | first3 = Yasuyuki | last3 = Ishikawa | first4 = Uzi | last4 = Kaldor}}.
*{{citation | title = Atomic and Molecular Properties of Elements 112, 114, and 118 | first = Clinton S. | last = Nash | journal = J. Phys. Chem. A | year = 2005 | volume = 109 | issue = 15 | pages = 3493–3500 | doi = 10.1021/jp050736o}}.
*{{citation | journal = J. Chem. Phys. | volume = 127 | pages = 134310 | year = 2007 | doi = 10.1063/1.2770712 | title = Intermetallic compounds of the heaviest elements and their homologs: The electronic structure and bonding of MM′, where M&nbsp;= Ge, Sn, Pb, and element 114, and M′&nbsp;= Ni, Pd, Pt, Cu, Ag, Au, Sn, Pb, and element 114 | first1 = V. | last1 = Pershina | first2 = J. | last2 = Anton | first3 = B. | last3 = Fricke}}.
*{{citation | journal = J. Chem. Phys. | volume = 131 | page = 084713 | year = 2009 | doi = 10.1063/1.3212449 | title = Theoretical predictions of adsorption behavior of elements 112 and 114 and their homologs Hg and Pb | first1 = V. | last1 = Pershina | first2 = J. | last2 = Anton | first3 = T. | last3 = Jacob}}.

==External links==
{{wikipedia|Ununquadium}}
*[http://www.webelements.com/ununquadium/ WebElements]

[[Category:Ununquadium| ]]
[[Category:Chemical elements]]

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