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(* = Graphable)

 114 ununtrium ← ununquadium → ununpentium Pb ↑ Uuq ↓ (Uhq)
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
Standard atomic weight [289] g·mol−1
Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p2
Electrons per shell 2, 8, 18, 32, 32, 18, 4
Phase unknown
CAS registry number 54085-16-4
Selected isotopes
iso NA half-life DM DE (MeV) DP
289Uuq syn 2.6 s α 9.82,9.48 285Uub
288Uuq syn 0.8 s α 9.94 284Uub
287Uuq syn 0.48 s α 10.02 283Uub
286Uuq syn 0.13 s 40% α 10.19 282Uub
60% SF
References

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First chemistry experiments indicate that element 114 may be the first superheavy to show abnormal noble-gas-like properties due to relativistic effects.[3]

In December 1998, scientists at Dubna (Joint Institute for Nuclear Research) in Russia bombarded a Pu-244 target with Ca-48 ions. A single atom of element 114, decaying by 9.67 MeV alpha-emission with a half-life of 30 s, was produced and assigned to 289114. This observation was subsequently published in January 1999.[4] However, the decay chain observed has not been repeated and the exact identity of this activity is unknown although it is possible that it is due to a meta-stable isomer, namely 289m114. The Joint Institute for Nuclear Research, JINR (ÐžÐ±ÑŠÐµÐ´Ð¸Ð½Ñ‘Ð½Ð½Ñ‹Ð¹ Ð¸Ð½ÑÑ‚Ð¸Ñ‚ÑƒÑ‚ ÑÐ´ÐµÑ€Ð½Ñ‹Ñ… Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ð¹, ÐžÐ˜Ð¯Ð˜ in Russian) in Dubna, Moscow Oblast (120 km north of Moscow), Russia is an international research centre for nuclear sciences, involving around 1000 scientists from eighteen states (Armenia, Azerbaijan, Belarus, Bulgaria, Cuba, Czech Republic, Georgia, Kazakhstan, DPR Korea, Moldova, Mongolia, Poland,Romania, Russia...

In March 1999, the same team replaced the Pu-244 target with a Pu-242 one in order to produce other isotopes. This time two atoms of element 114 were produced, decaying by 10.29 MeV alpha-emission with a half-life of 5.5 s. They were assigned as 287114.[5] Once again, this activity has not been seen again and it is unclear what nucleus was produced. It is possible that it was a meta-stable isomer, namely 287m114.

The now-confirmed discovery of element 114 was made in June 1999 when the Dubna team repeated the Pu-244 reaction. This time, two atoms of element 114 were produced decaying by emission of 9.82 MeV alpha particles with a half life of 2.6 s.[6]

This activity was initially assigned to 288114 in error, due to the confusion regarding the above observations. Further work in Dec 2002 has allowed a positive reassignment to 289114.[7]

$,^{244}_{94}mathrm{Pu} + ,^{48}_{20}mathrm{Ca} , to ,^{292}_{114}mathrm{Uuq} ,^{*} to ^{289}_{114}mathrm{Uuq}+ 3 ; ^1_0mathrm{n}$

## Naming

### Current Names

The element with Z=114 is historically known as eka-lead. Ununquadium (Uuq) is a temporary IUPAC systematic element name. Research scientists usually refer to the element simply as element 114 (E114). The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization devoted to the advancement of chemistry. ... In chemistry, heavy transuranic elements receive a permanent trivial name and symbol only after their synthesis has been confirmed. ...

### Proposed names by claimants

Claims to the discovery of element 114 have been put forward by Dmitriev of the Dubna team. The JWP will decide to whom the right to suggest a name will be given. The IUPAC have the final say on the official adoption of a name. The table below gives the names that the teams above have suggested and which can be verified by press interviews.

### Disallowed names

According to IUPAC rules, names used for previous elements that have ultimately not been adopted are not allowed to be proposed for future use. The table below summarises those names which are probably not allowed to be proposed by the claimant laboratories under the rules.

Name Symbol Reason
Russium Rs Used for claimed discovery of element 43
Kurchatovium Ku Used for claimed discovery of element 104

### Plausible names

Many speculative names appear in popular literature. The table below lists these names in the case where they obey IUPAC rules and are plausible with regard to the claimant laboratories. Rumored suggestions linked to the claimant laboratories are also included.

Atlantisium An Atlantis, reference to fabled island of stability
Lazarevium Lz Yuri Lazarev, late former leader of the Dubna team
Oganessium Og Yuri Oganessian, leader of the discovery Dubna team

## Electronic structure

Ununquadium has 6 full shells, 7s+5p+4d+2f=18 full subshells, and 114 orbitals: Example of a sodium electron shell model An electron shell, also known as a main energy level, is a group of atomic orbitals with the same value of the principal quantum number n. ... The s-block of the periodic table of the elements consists of the first two groups: the alkali metals and alkaline earth metals, plus hydrogen and helium. ... The p-block of the periodic table of the elements consists of the last six groups minus helium (which is located in the s-block). ... D-Block is an American rap group founded in the 1990s by Sheek Louch, Jadakiss and Styles P as The Lox or The L.O.X.. [1] In 2001 the group renamed themselves from The Lox to D-Block. They currently dont have a record deal[2] // ^ http://www. ... The f-block of the periodic table of elements consists of those elements for which, in the atomic ground state, the highest-energy electrons occupy f-orbitals. ... In atomic physics, an electron subshell is a group of atomic orbitals with the same values of the principal quantum number n and the angular momentum quantum number l. ... The term orbital has several meanings: In physics and chemistry it is used to describe an atomic electron configuration, see also molecular orbital and atomic orbital. ...

Bohr model: 2, 8, 18, 32, 32, 18, 4

Quantum mechanical model: 1s22s22p63s23p64s23d10 4p65s24d105p66s24f145d10 6p67s25f146d107p2

## Extrapolated chemical properties of eka-lead

### Chemistry

Element 114 should portray eka-lead chemical properties and should therefore from a monoxide, UuqO, and dihalides, UuqF2, UuqCl2, UuqBr2, and UuqI2. If the +IV state is accessible, it is likely that it is only possible in the oxide, UuqO2, and fluoride, UutF4. It may also show a mixed oxide, Uuq3O4, analogous to Pb3O4.

Some studies also suggest that the chemical behaviour of element 114 might in fact be closer to that of the noble gas radon, than to that of lead.[8]

## Physical properties

A summary of the expected properties of element 114 are given in the table below:

Config. Oxidation State First IE Density Melting Point Boiling Point Hydrides Fluorides Chlorides
7p27s2 +2 8.5 eV 14 g/cm3 67 °C 147 °C H4Uuq UuqF2 UuqCl2

## Experimental chemistry

### Atomic gas phase

Two experiments were performed in April-May 2007 in a joint FLNR-PSI collaboration aiming to study the chemistry of element 112. The first experiment involved the reaction 242Pu(48Ca,3n)287114 and the second the reaction 244Pu(48Ca,4n)288114. The adsorption properties of the resultant atoms on a gold surface were compared with those of radon. The first experiment allowed detection of 3 atoms of 283112 (see ununbium) but also seemingly detected 1 atom of 287114. This result was a surprise given the transport time of the product atoms is ~2 s, so element 114 atoms should decay before adsorption. In the second reaction, 2 atoms of 288114 and possibly 1 atom of 289114 were detected. Two of the three atoms portrayed adsorption characteristics associated with a volatile, noble-gas-like element, which has been suggested but is not predicted by more recent calculations. Further experiments will be performed in 2008 to confirm this important result.[1] These experiments did however provide independent confirmation for the discovery of elements 112, 114, and 116 via comparison with published decay data. General Name, Symbol, Number ununbium, Uub, 112 Chemical series transition metals Group, Period, Block 12, 7, d Appearance unknown, probably silvery white or metallic gray liquid Atomic mass (285) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 (guess based on mercury) Electrons per shell 2, 8, 18, 32, 32...

## History of synthesis of isotopes by cold fusion

### 208Pb(76Ge,xn)284−x114

The first attempt to synthesise element 114 in cold fusion reactions was performed at GANIL, France in 2003. No atoms were detected providing a yield limit of 1.2 pb.

## History of synthesis of isotopes by hot fusion

### 244Pu(48Ca,xn)292−x114 (x=3,4,5)

The first experiments on the synthesis of element 114 were performed by the team in Dubna in November 1998. They were able to detect a single, long decay chain, assigned to 289114.[4] The reaction was repeated in 1999 and a further 2 atoms of element 114 were detected. The products were assigned to 288114.[6] The team further studied the reaction in 2002. During the measurement of the 3n, 4n, and 5n neutron evaporation excitation functions they were able to detect 3 atoms of 289114, 12 atoms of the new isotope 288114, and 1 atom of the new isotope 287114. Based on these results, the first atom to be detected was tentatively reassigned to 290114 or 289m114, whilst the two subsequent atoms were reassigned to 289114 and therefore belong to the unofficial discovery experiment.[7] In an attempt to study the chemistry of element 112 as the isotope 285112, this reaction was repeated in April 2007. Surprisingly, a PSI-FLNR directly detected 2 atoms of 288114 forming the basis for the first chemical studies of element 114.

### 242Pu(48Ca,xn)290−x114 (x=2,3,4)

The team at Dubna first studied this reaction in March-April 1999 and detected two atoms of element 114, assigned to 287114.[5] The reaction was repeated in September 2003 in order to attempt to confirm the decay data for 287114 and 283112 since conflicting data for 283112 had been collected (see ununbium). The Russian scientists were able to measure decay data for 288114,287114 and the new isotope 286114 from the measurement of the 2n, 3n, and 4n excitation functions. [9] [10] In April 2006, a PSI-FLNR collaboration used the reaction to determine the first chemical properties of element 112 by producing 283112 as an overshoot product. In a confirmatory experiment in April 2007, the team were able to detect 287114 directly and therefore measure some initial data on the atomic chemical properties of element 114. General Name, Symbol, Number ununbium, Uub, 112 Chemical series transition metals Group, Period, Block 12, 7, d Appearance unknown, probably silvery white or metallic gray liquid Atomic mass (285) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 (guess based on mercury) Electrons per shell 2, 8, 18, 32, 32...

## Synthesis of isotopes as decay products

The isotopes of ununquadium have also been observed in the decay of elements 116 and 118 (see ununoctium for decay chain). General Name, Symbol, Number ununhexium, Uuh, 116 Chemical series presumably poor metals Group, Period, Block 16, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (302) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p4 (guess based on polonium) Electrons per shell 2, 8, 18, 32... General Name, Symbol, Number ununoctium, Uuo, 118 Chemical series noble gases Group, Period, Block 18, 7, p Appearance unknown, probably colorless Atomic mass predicted, (314) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p6 (guess based on radon) Electrons per shell 2, 8, 18, 32, 32, 18, 8 Phase... General Name, Symbol, Number ununoctium, Uuo, 118 Chemical series noble gases Group, Period, Block 18, 7, p Appearance unknown, probably colorless Atomic mass predicted, (314) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p6 (guess based on radon) Electrons per shell 2, 8, 18, 32, 32, 18, 8 Phase...

Evaporation residue Observed Uuq isotope
293116 289114 [11][10]
292116 288114 [10]
291116 287114 [7]
294118, 290116 286114 [12]

## Chronology of isotope discovery

Isotope Year discovered Discoverer reaction
286Uuq 2002 249Cf(48Ca,3n) [13]
287Uuq 2002 244Pu(48Ca,5n)
288Uuq 2002 244Pu(48Ca,4n)
289Uuq 1998?, 1999 244Pu(48Ca,3n)

## Yields of isotopes

The tables below provide cross-sections and excitation energies for cold fusion reactions producing ununquadium isotopes directly. Data in bold represent maxima derived from excitation function measurements. + represents an observed exit channel.

### Cold fusion

Projectile Target!CN 1n 2n 3n
76Ge 208Pb 284Uuq < 1.2 pb

### Hot fusion

Projectile Target CN 2n 3n 4n 5n
48Ca 242Pu 290Uuq 0.5 pb, 32.5 MeV 3.6 pb, 40.0 MeV 4.5 pb, 40.0 MeV <1.4 pb , 45.0 MeV
48Ca 244Pu 292Uuq 1.7 pb, 40.0 MeV 5.3 pb, 40.0 MeV 1.1 pb, 52.0 MeV

### 289114

In the first claimed synthesis of element 114, an isotope assigned as 289114 decayed by emitting a 9.71 MeV alpha particle with a lifetime of 30 seconds. This activity was not observed in repetitions of the direct synthesis of this isotope. However, in a single case from the synthesis of 293116, a decay chain was measured starting with the emission of a 9.63 MeV alpha particle with a lifetime of 2.7 minutes. All subsequent decays were very similar to that observed from 289114, presuming that the parent decay was missed. This strongly suggests that the activity should be assigned to an isomeric level. The absence of the activity in recent experiments indicates that the yield of the isomer is ~20% compared to the supposed ground state and that the observation in the first experiment was a fortunate (or not as the case history indicates). Further research is required to resolve these issues. Given an assembly of elements, the number of which decreases ultimately to zero, the lifetime (also called the mean lifetime) is a certain number that characterizes the rate of reduction (decay) of the assembly. ...

### 287114

In a manner similar to those for 289114, first experiments with a 242Pu target identified an isotope 287114 decaying by emission of a 10.29 MeV alpha particle with a lifetime of 5.5 seconds. The daughter spontaneously fissioned with a lifetime in accord with the previous synthesis of 283112. Both these acitivities have not been observed since (see ununbium). However, the correlation suggests that the results are not random and are possible due to the formation of isomers whose yield is obviously dependent on production methods. Further research is required to unravel these discrepancies. General Name, Symbol, Number ununbium, Uub, 112 Chemical series transition metals Group, Period, Block 12, 7, d Appearance unknown, probably silvery white or metallic gray liquid Atomic mass (285) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 (guess based on mercury) Electrons per shell 2, 8, 18, 32, 32...

## Retracted isotopes

### 285114

In the claimed synthesis of 293118 in 1999, the isotope 285114 was identified as decaying by 11.35MeV alpha emission with a half-life of 0.58 ms. The claim was retracted in 2001 and hence this ununquadium isotope is currently unknown or unconfirmed. Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ...

## In search for the island of stability: 298114

According to macroscopic-microscopic (MM) theory[citation needed], Z=114 is the next spherical magic number. This means that such nuclei are spherical in their ground state and should have high, wide fission barriers to deformation and hence long SF partial half-lives. Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ...

In the region of Z=114, MM theory indicates that N=184 is the next spherical neutron magic number and puts forward the nucleus 298114 as a strong candidate for the next spherical doubly magic nucleus, after 208Pb (Z=82, N=126). 298114 is taken to be at the centre of a hypothetical ‘island of stability’. However, other calculations using relativistic mean field (RMF) theory propose Z=120, 122, and 126 as alternative proton magic numbers depending upon the chosen set of parameters. It is possible that rather than a peak at a specific proton shell, there exists a plateau of proton shell effects from Z=114–126. 3-dimensional rendering of the theoretical Island of Stability. ...

It should be noted that calculations suggest that the minimum of the shell-correction energy and hence the highest fission barrier exists for 297115, caused by pairing effects. Due to the expected high fission barriers, any nucleus within this island of stability will exclusively decay by alpha-particle emission and as such the nucleus with the longest half-life is predicted to be 298114. The expected half-life is unlikely to reach values higher than about 10 minutes, unless the N=184 neutron shell proves to be more stabilising than predicted, for which there exists some evidence.[citation needed] In addition, 297114 may have an even-longer half-life due to the effect of the odd neutron, creating transitions between similar Nilsson levels with lower Qalpha values. Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ...

In either case, an island of stability does not represent nuclei with the longest half-lives but those which are significantly stabilised against fission by closed-shell effects. Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ...

### Evidence for Z=114 closed proton shell

Whilst evidence for closed neutron shells can be deemed directly from the systematic variation of Qalpha values for ground-state to ground-state transitions, evidence for closed proton shells comes from (partial) spontaneous fission half-lives. Such data can sometimes be difficult to extract due to low production rates and weak SF branching. In the case of Z=114, evidence for the effect of this proposed closed shell comes from the comparison between the nuclei pairings 282112 (TSF1/2 = 0.8 ms) and 286114 (TSF1/2 = 130 ms), and 284112 (TSF = 97 ms) and 288114 (TSF >800 ms). Further evidence would come from the measurement of partial SF half-lives of nuclei with Z>114, such as 290116 and 292118 (both N=174 isotones). The extraction of Z=114 effects is complicated by the presence of a dominating N=184 effect in this region. Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ...

### Difficulty in synthesis

The direct synthesis of ununquadium-298 by a fusion-evaporation pathway is impossible since no known combination of target and projectile can provide 184 neutrons in the compound nucleus.

It has been suggested that such a neutron-rich isotope can be formed by the quasi-fission of a massive nucleus. Such nuclei tend to fission with the formation of isotopes close to the closed shells Z=20/N=20 (40Ca), Z=50/N=82 (132Sn)or Z=82/N=126 (208Pb/209Bi). If Z=114 does represent a closed shell, then the reaction below may represent a method of synthesis:

$,^{204}_{80}mathrm{Hg} + ,^{136}_{54}mathrm{Xe} , to ,^{298}_{114}mathrm{Uuq} + ,^{40}_{20}mathrm{Ca} + 2 ; ^1_0mathrm{n}.$

It is also possible that 298114 can be synthesised by the alpha decay of a massive nucleus. Such a method would depend highly on the SF stability of such nuclei, since the alpha half-lives are expected to be very short. The yields for such reactions will most likely be extremely small. One such reaction is

$,^{244}_{94}mathrm{Pu} + ,^{96}_{40}mathrm{Zr} , to ,^{338}_{134}mathrm{Utq} + 2 ; ^1_0mathrm{n};$
$,^{338}_{134}mathrm{Utq}, to to ,^{298}_{114}mathrm{Uuq} + 10 ;^{4}_{2}mathrm{He}.$

## Future experiments

The team at RIKEN are planning to study the reaction RIKEN is the largest research institute for natural sciences in Japan. ...

$,^{208}_{82}mathrm{Pb} + ,^{76}_{32}mathrm{Ge} to ,^{284}_{114}mathrm{Uuq} ^{*} to ?.$

## References

1. ^ [1]
2. ^ [2]
3. ^ http://lch.web.psi.ch/pdf/TexasA&M/TexasA&M.pdf (Gas Chem 2007 Review)
4. ^ a b "Synthesis of Superheavy Nuclei in the 48Ca + 244Pu Reaction", Oganessian et al., Phys. Rev. Lett. 83, 3154 - 3157 (1999).Retrieved on 2008-03-03
5. ^ a b "Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca", Oganessian et al., Nature 400, 242-245 (15 July 1999). Retrieved on 2008-03-03
6. ^ a b "Synthesis of superheavy nuclei in the 48Ca+244Pu reaction: 288114", Oganessian et al., Phys. Rev. C 62, 041604 (2000). Retrieved on 2008-03-03
7. ^ a b c "Measurements of cross sections for the fusion-evaporation reactions 244Pu(48Ca,xn)292−x114 and 245Cm(48Ca,xn)293−x116", Oganessian et al., Phys. Rev. C 69, 054607 (2004). Retrieved on 2008-03-03
8. ^ http://lch.web.psi.ch/pdf/TexasA&M/TexasA&M.pdf
9. ^ "Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions 233,238U, 242Pu, and 248Cm+48Ca", Oganessian et al., Phys. Rev. C 70, 064609 (2004). Retrieved on 2008-03-03
10. ^ a b c "Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions 233,238U , 242Pu , and 248Cm+48Ca", Oganessian et al., JINR preprints, 2004. Retrieved on 2008-03-03
11. ^ see ununhexium
12. ^ see ununoctium
13. ^ see ununoctium

2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Anno Domini (or common era), in accordance to the Gregorian calendar. ... is the 62nd day of the year (63rd in leap years) in the Gregorian calendar. ... General Name, Symbol, Number ununhexium, Uuh, 116 Chemical series presumably poor metals Group, Period, Block 16, 7, p Appearance unknown, probably silvery white or metallic gray Atomic mass (302) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p4 (guess based on polonium) Electrons per shell 2, 8, 18, 32... General Name, Symbol, Number ununoctium, Uuo, 118 Chemical series noble gases Group, Period, Block 18, 7, p Appearance unknown, probably colorless Atomic mass predicted, (314) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p6 (guess based on radon) Electrons per shell 2, 8, 18, 32, 32, 18, 8 Phase... General Name, Symbol, Number ununoctium, Uuo, 118 Chemical series noble gases Group, Period, Block 18, 7, p Appearance unknown, probably colorless Atomic mass predicted, (314) g/mol Electron configuration perhaps [Rn] 5f14 6d10 7s2 7p6 (guess based on radon) Electrons per shell 2, 8, 18, 32, 32, 18, 8 Phase...

3-dimensional rendering of the theoretical Island of Stability. ... General Name, Symbol, Number unbinilium, Ubn, 120 Chemical series Presumably Alkali earths Group, Period, Block 2, 8, s Appearance unknown, probably metallic and silvery white or grey colour Image:.jpg Atomic mass [318] amu (a guess) g/mol Electron configuration Uuo 8s2 (a guess based upon barium and radium) Electrons... General Name, Symbol, Number unbihexium, Ubh, 126 Chemical series Superactinides Group, Period, Block g6, 8, g Appearance unknown - silvery or grey in color Image:.jpg Atomic mass [334] gÂ·molâˆ’1 Electron configuration [Uuo] 5g6 8s2 Electrons per shell 2, 8, 18, 32, 38, 18, 8, 2 Physical properties Phase... General Name, Symbol, Number lead, Pb, 82 Chemical series Post-transition metals or poor metals Group, Period, Block 14, 6, p Appearance bluish gray Standard atomic weight 207. ... An extended periodic table was suggested by Glenn T. Seaborg in 1969. ... Ununquadium (Uuq) has no stable isotopes. ...

Results from FactBites:

 ununquadium. The Columbia Encyclopedia, Sixth Edition. 2001-05 (327 words) Late in Dec., 1998, using plutonium-244 and calcium-48 isotopes provided by the Lawrence Berkeley National Laboratory in Calif., Russian scientists employed a cyclotron at the Joint Institute for Nuclear Research in Dubna to produce an atom of element 114 with a mass number of 289. After a surprisingly long existence of 30 seconds, the ununquadium atom broke down successively into ununbium (element 112), darmstadtium (element 110), and hassium (element 108). Ununquadium is the first element of what might be an “island of stability”; among heavy nuclei.
More results at FactBites »

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