Ununtrium: the essentials
On 12 August 2013 experiments involving zinc ions travelling at 10% of the speed of light colliding with a thin bismuth layer apparently produced a very heavy ion followed by a chain of six consecutive alpha decays identified as products of an isotope of element 113 278Uut - see new evidence for elements 113.
Experiments resulting in the formation of element 115 were reported in February 2004 following experiments carried out between 14 July - 10 August 2003 involving scientists at Dubna (Joint Institute for Nuclear Research at the U400 cyclotron with the Dubna gas-filled recoil separator, DGFRS) in Russia in a collaboration also involving scientists at the Lawrence Livermore National Laboratory, USA. In these experiments, the primary product were four nuclei of element 115 isotopes. All these four nuclei decayed through the emisson of α-particles to isotopes of element 113. The claim has not yet been ratified, but the results are now published in a reputable peer-reviewed journal.
- Name: ununtrium
- Symbol: Uut
- Atomic number: 113
- Relative atomic mass (Ar): [ 284 ]
- Standard state: presumably a solid at 298 K
- Colour: unknown, but probably metallic and silvery white or grey in appearance
- Classification: Metallic
- Group in periodic table: 13
- Group name: (none)
- Period in periodic table: 7
- Block in periodic table: p-block
- Electron shell structure: 2.8.18.32.32.18.3
- CAS Registry ID: 54084-70-7
Ununtrium: historical information
On 12 August 2013 experiments involving zinc ions travelling at 10% of the speed of light colliding with a thin bismuth layer apparently produced a very heavy ion followed by a chain of six consecutive alpha decays identified as products of an isotope of element 113 278Uut - see new evidence for elements 113.
Experimental results reported in 2004 involving the bombardment of americium-243 with calcium-48 ions are consistent with the formation in the laboratory of a few atoms of elements 113 and 115. In experiments conducted at the JINR U400 cyclotron with the Dubna gas-filled separator between July 14 and Aug. 10, 2003, atomic decay patterns were observed said to confirm the existence of element 115 and element 113. In these decay chains, element 113 is produced via the α-decay of element 115.
The results are published in the 1 February 2004 issue of Physical Review C: "Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291–x115", Yu. Ts. Oganessian, V. K. Utyonkoy, Yu. V. Lobanov, F. Sh. Abdullin, A. N. Polyakov, I. V. Shirokovsky, Yu. S. Tsyganov, G. G. Gulbekian, S. L. Bogomolov, A. N. Mezentsev, S. Iliev, V. G. Subbotin, A. M. Sukhov, A. A. Voinov, G. V. Buklanov, K. Subotic, V. I. Zagrebaev, M. G. Itkis, J. B. Patin, K. J. Moody, J. F. Wild, M. A. Stoyer, N. J. Stoyer, D. A. Shaughnessy, J. M. Kenneally, and R. W. Lougheed, Phys. Rev. C, 2004, 69, 021601(R).
Ununtrium around us Read more »
As only a very few atoms of element 113 have ever been made, it has no biological role.
Only a few atoms of element 113 (ununtrium, Uut) have ever been made, and it does not occur at all in the geosphere.
| Location | ppb by weight | ppb by atoms | Links |
|---|---|---|---|
| Universe | (no data) | (no data) | 
|
| Crustal rocks | (no data) | (no data) | 
|
| Human | (no data) ppb by weight | (no data) atoms relative to C = 1000000 | 
|
Physical properties Read more »
Density of solid: 16000 (predicted) kg m-3
Molar volume: |196| cm3
Thermal conductivity: |206| W m‑1 K‑1
Heat properties Read more »
Melting point: (no data) K
Boiling point: (no data) K
Enthalpy of fusion: |203| kJ mol-1
Crystal structure Read more »
The solid state structure of ununtrium is: .
Ununtrium: orbital properties Read more »
Ununtrium atoms have 113 electrons and the shell structure is 2.8.18.32.32.18.3. The ground state electronic configuration of neutral Ununtrium is [Rn].5f14.6d10.7s2.7p1 (a guess based upon that of thallium) and the term symbol of Ununtrium is 2P1/2 (a guess based upon guessed electronic structure).
Pauling electronegativity: (no data) (Pauling units)
First ionisation energy: (no data) kJ mol‑1
Second ionisation energy: (no data) kJ mol‑1
Isolation
Isolation: currently, the identification of element 113 is yet to be confirmed by IUPAC, but the experiments leading to element 113 are now published in a prestigious peer reviewed journal. As only about four atoms of element 113 has ever been made (through decomposition of element 115 nuclei made in nuclear reactions involving fusing calcium nuclei with americium nuclei) isolation of an observable quantity has never been achieved, and may well never be. In the experiments leading to element 115 the following reactions occurred
24395Am + 4820Ca → 287115Uup + 4 1n
24395Am + 4820Ca → 288115Uup + 3 1n
In these first experiments, three nuclei of the 288Uup isotope were made and one of the 287Uup isotope. All the nuclei formed decayed in less than a second by emitting α-particles. These decays resulted in isotopes of ununtrium, element 113, (mass number 283 or 284, containing 113 protons and either 170 or 171 neutrons). These isotopes of element 113 are also radioactive and underwent further α-decay processes to isotopes of element 111 and so on down to at least element 105 (dubnium). One of the nuclei took over a second to decay to element 111.
287115Uup → 283113Uut + 42He (46.6 milliseconds) → 279111Uuu + 42He (147 milliseconds)
288115Uup → 284113Uut + 42He (80.3 milliseconds) → 280111Uuu + 42He (376 milliseconds)
288115Uup → 284113Uut + 42He (18.6 milliseconds) → 279111Uuu + 42He (1196 milliseconds)
288115Uup → 284113Uut + 42He (280 milliseconds) → 279111Uuu + 42He (517 milliseconds)
Ununtrium isotopes Read more »
| Isotope | Mass /Da |
Natural abund. (atom %) |
Nuclear spin (I) |
Nuclear magnetic moment (μ/μN) |
|---|---|---|---|---|
| nil |
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