|Name in Saurian|| Tahusaim (Th)|
|Systematic name|| Unpenttrium (Upt)|
|Location on the periodic table|
|Above element||Mendelevium (101Md)|
|Previous element||Wittenium (152Wt)|
|Next element||Lewisium (154Le)|
|436.6234 u, 725.0302 yg|
|Atomic radius||125 pm, 1.25 Å|
|Van der Waals radius||187 pm, 1.87 Å|
|s||433 (153 p+, 280 n0)|
|Electron configuration|| [Mc] 5g18 6f11 7d2 8s2 8p2|
2, 8, 18, 32, 50, 29, 10, 4
|Oxidation states|| 0, +1|
(mildly basic oxide)
|First ionization energy||1190.2 kJ/mol, 12.335 eV|
|Electron affinity||7.6 kJ/mol, 0.079 eV|
|Covalent radius||134 pm, 1.34 Å|
|Molar mass||436.623 g/mol|
|Molar volume||37.742 cm3/mol|
|Atomic number density|| 1.38 × 1021 g−1|
1.60 × 1022 cm−3
|Average atomic separation||397 pm, 3.97 Å|
|Crystal structure||Simple hexagonal|
|Melting point|| 1202.46 K, 2164.43°R|
|Boiling point|| 2510.32 K, 4518.58°R|
|Liquid range||1307.86 , 2354.15|
|Triple point|| 1202.47 K, 2164.44°R|
@ 167.23 mPa, 0.0012544 torr
|Critical point|| 5980.25 K, 10764.45°R|
@ 188.1941 MPa, 1857.338 atm
|Heat of fusion||12.859 kJ/mol|
|Heat of vaporization||240.959 kJ/mol|
|Heat capacity|| 0.05447 J/(g• ), 0.09804 J/(g• )|
23.782 J/(mol• ), 42.807 J/(mol• )
|Universe (by mass)|| Relative: 8.69 × 10−41|
Absolute: 2.91 × 1012 kg
Diracium is the fabricated name of a hypothetical element with the symbol Dr and atomic number 153. Diracium was named in honor of Paul Dirac (1902–1984), who made fundamental contributions to the early development of both quantum mechanics and quantum electrodynamics. This element is known in the scientific literature as unpenttrium (Upt), eka-mendelevium, or simply element 153. Diracium is the thirteenth member of the dumaside series, found in the third row of f-block (below thulium and mendelevium); this element is located in the periodic table coordinate 6f13.
Diracium is a grayish white shiny metal that never tarnishes in the air. One mole of diracium weighs 437 grams, close to a pound (approx. 454 grams), and takes up 38 cubic centimeters or about 21⁄3 cubic inches of space. If we divide molar mass in grams by molar volume in cubic centimeters, the answer would be 11.6 g/cm3, that is, its density. Diracium atoms arrange to form hexagonal crystals and is paramagnetic along with 64% of other elements.
Diracium liquifies at 1202 K and vaporizes at 2510 K, resulting in its liquid ratio of 2.09. During these processes, one mole of diracium requires 13 kJ and 241 kJ of energy, respectively. One mole of diracium absorbs 24 joules to heat the metal by 1 K, while it releases that same amount to cool by 1 K.
Diracium atom has 24 orbitals in 8 shells containing 153 electrons surrounding the nucleus comprising of 433 nucleons (153 protons, 280 neutrons) and the nuclear ratio of 1.83. Despite it is the second to last element of the f-block series, the f-orbital needs three more electrons to complete its orbital. Due to spin-orbit coupling there are two electrons in the d-orbital. Even that, from the previous element, f-orbital acquired two electrons while d-orbital lost an electron.
Like every other element heavier than lead, diracium has no stable isotopes. The most stable isotope is 433Dr with a brief half-life of 17.3 milliseconds. It undergoes spontaneous fission, splitting into two or three lighter nuclei plus neutrons like the examples.
Diracium has several meta states. The longest lived is 435mDr with a half-life of just 564 microseconds, less than 1⁄30 the half-life of 433Dr.
Diracium's chemical properties are very different from lighter homologue mendelevium due to its much smaller atomic size and much higher ionization energies. The stable oxistates are just 0 and +1. The electron affinity is 7.6 kJ/mol, which is low. Thus due to relativistic effects, diracium is extremely unreactive, meaning the metal is very stable in air, as well as in acids and alkalis.
Diracium would react with strong reducing oxides such as dichlorine monoxide at high temperatures to form Dr2O, which is an orange-brown brittle solid. DrF (white) and DrCl (white) can be made by heating diracium with free fluorine and chlorine gases, respectively. Other halides are DrBr (yellow) and DrI (pink), which are more difficult to make. Halides can even combine with oxygen to form oxyhalides, such as Dr3OBr. Despite its unreactivity, organic compounds of diracium (organodiracium) are possible to make. An example is ethyldiracium (C2H5Dr), which is a colorless liquid, obtained by electrifying diracium oxide in the mixture of ethanol and hydrochloric acid.
Occurrence and synthesis Edit
It is almost certain that diracium doesn't exist on Earth at all, but it is believe to exist somewhere in the universe, at least barely. Since every element heavier than lithium were produced by stars, then diracium must be produced in stars, and then thrown out into space by exploding stars. But it is theoretically impossible for even the most powerful supernovae or most violent neutron star collisions to produce this element through r-process because there's not enough energy available or not enough neutrons, respectively, to produce this hyperheavy element. Instead, this element virtually can only be made by advanced technological civilizations. An estimated abundance of diracium in the universe by mass is 8.69 × 10−41, which amounts to 2.91 × 1012 kilograms or about twice the total biomass of fish worth of diracium.
To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize diracium. To synthesize most stable isotopes of diracium, nuclei of a couple lighter elements must be fused together, and right amount of neutrons must be seeded. This operation would be extremely difficult since it requires a vast amount of energy and even if nuclei of this element were produced would immediately decay due to its brief half-life. Here's couple of example equations in the production of the most stable isotope, 433Dr.