|Name in Saurian|| Tomeshakaim (Tm)|
|Systematic name|| Unbibium (Ubb)|
|Location on the periodic table|
|Previous element||Lavoisium (121Ls)|
|Next element||Moselium (123Ms)|
|Atomic mass||328.7223 u, 545.8562 yg|
|Atomic radius||188 pm, 1.88 Å|
|Van der Waals radius||217 pm, 2.17 Å|
|Nucleons||326 (122 p+, 204 n0)|
|Nuclear radius||8.23 fm|
|Electron configuration|| [Mc] 7d1 8s2 8p1|
2, 8, 18, 32, 32, 18, 9, 3
|Oxidation states|| +2, +3, +4|
(strongly basic oxide)
|First ionization energy||505.7 kJ/mol, 5.241 eV|
|Electron affinity||12.0 kJ/mol, 0.125 eV|
|Covalent radius||191 pm, 1.91 Å|
|Molar mass||328.722 g/mol|
|Molar volume||20.091 cm3/mol|
|Atomic number density||3.00 × 1022 cm−3|
|Average atomic separation||322 pm, 3.22 Å|
|Speed of sound||1148 m/s|
|Crystal structure||Simple tetragonal|
|Color|| Grayish white|
|Melting point|| 1312.85 K, 1039.70°C|
|Boiling point|| 2004.19 K, 1731.04°C|
|Liquid range||691.34 K/°C, 1244.41°F/°R|
|Triple point|| 1312.84 K, 1039.69°C|
@ 211.62 Pa, 1.5873 torr
|Critical point|| 4313.06 K, 4039.91°C|
@ 34.2586 MPa, 338.107 atm
|Heat of fusion||14.591 kJ/mol|
|Heat of vaporization||178.465 kJ/mol|
|Heat capacity|| 0.05621 J/g/K, 0.10117 J/g/°R|
18.476 J/mol/K, 33.257 J/mol/°R
|Universe (by mass)|| Relative: 4.60 × 10−14|
Absolute: 1.54 × 1039 kg
Democritium is the fabricated name of an undiscovered element with the symbol Dm and atomic number 122. Democritium was named in honor of Democritus (ca. 460 BC–ca. 370 BC), who provided the first definition of atom. This element is known in scientific literature as unbibium (Ubb), or simply element 122. Democritium is the second element of the lavoiside series and located in periodic table coordinate 5g2.
Like most metals, democritium is silvery that is soft and lustrous. Democritium has the density of 16.36 g/cm3, three times denser than Earth and would sink very quickly in water. Democritium has a tetragonal crystal structure and is diamagnetic. The sound would travel through this metal at 1148 m/s, which is thrice that through the air. There are 30 sextillion atoms in one mole of democritium, thrice as many as stars in the observable universe, and the average distance between atoms is 3.22 Å.
The melting point of democritium is 1040°C (1313 K) and the boiling point is 1731°C (2004 K), corresponding to its liquid range of 691°C (691 K) and liquid ratio 1.53. The pressure where boiling point equals its melting point, called its triple point, is 212 pascals, which is one-third the atmospheric pressure of Mars.
Democritium has 122 protons, hence its atomic number, and 204 neutrons. Summing protons and neutrons yields 326 nucleons, which is its mass number. Its atomic mass, summing up all of the subatomic particles within the atom, is 328.7223 daltons.
There are 122 electrons in eight energy levels and 22 orbitals, hence the notation 122-8-22. Number of electrons must equal the number of protons in order to be called an atom, if any other number of electrons, it would be called an ion. Like all other g-block, f-block, and d-block elements, democritium has two electrons in the outermost shell, just like in the innermost shell. Despite democritium is a g-block element, there is one electron in the 8p orbital as well as one in the 7d orbital due to relativistic effect.
Its electronegativity, the scale to acquire electrons from another atom, is 0.97, which is low, but near the typical value for other g-block elements. Its atomic radius is 208 pm. Combining a relatively large atom with a low electronegativity would make democritium a reactive element.
Like every other elements heavier than lead, democritium has no stable isotopes. The most stable isotope is 326Dm with an extremely long half-life of 84 billion years, merely six times longer than the present age of our universe at 13.8 billion years, because democritium is a member of the island of stability. It alpha decays to 322Gl. 326Dm is the longest isotope of any element since 209Bi, whose half-life is over 100,000 times longer.
There are two other long-lived isotopes: 325Dm with a half-life of 6.275 million years, and 327Dm with a half-life of 45.8 billion years. Both isotopes alpha decay to 321Gl and 323Gl, respectively. All of the remaining isotopes have half-lives of less than 5000 years and the majority of these have half-lives of less than two years. 324Dm has a half-life of 4713 years, 1001 years less than the half-life of carbon-14. Like most elements, democritium has meta states. The longest-lived is 323m1Dm which decay through gamma emission to 323Dm with a very long half-life of 2.7 years.
In the universe, 326Dm makes up 97.54% of all democritium atoms, 327Dm makes up the remaining 2.46%.
Democritium is assumed to behave like other lavoisoids. Due to electrons filling in different orbital because of the closeness to each other, not all lavoisoids have similar chemical properties. Due to its low electronegativity (1.07), low ionization energy (5.24 eV), and high atomic radius (188 pm), democritium would be reactive. As it is typical for g-block elements, democritium would readily combine with nonmetals, water and acids. Democritium strongly exhibits a +4 oxidation state (tetravalent), while +2 (divalent) and +3 (trivalent) states are also stable but less common. The electron configuration of Dm4+ ion, often found in solutions, is the same as moscovium.
Democritium(IV) oxide (DmO2) is a yellowish white solid. The latter oxide is more common since the metal simply bond with oxygen molecule of the air. The lesser known oxides are democritium(III) oxide (Dm2O3) and democritium(II) oxide (DmO), which are orange and pale green solids, respectively. Democritium(IV) hydroxide (Dm(OH)4) is a white powder formed when democritium or an oxide reacts vigorously with water. Democritium(IV) sulfate (Dm(SO4)2) is a yellow powder formed when the democritium reacts vigorously with sulfuric acid. Democritium(IV) nitrate (Dm(NO3)4) is a pale pink powder formed when the metal reacts readily with nitric acid. Democritium(IV) carbonate (Dm(CO3)2) is a dark red powder formed when the metal slowly reacts with carbonic acid. Like almost all other elements, democritium reacts most vigorously with fluorine and chlorine. Democritium(III) fluoride (DmF3) and democritium(III) chloride (DmCl3) are maroon salt and crimson salt respectively. DmF3 and DmCl3 can also form when the metal reacts with corresponding hydrohalic acids. Democritium(IV) sulfide (DmS2) is a light orange solid formed when it reacts with sulfur or hydrogen sulfide. Democritium(III) nitride (DmN) is a white solid formed when the metal reacts with pure nitrogen or ammonia at around 300°C.
Democritium can react with organic compounds to form organodemocritium compounds, such as trimethyldemocritium (Me3Dm).
Occurrence and synthesis Edit
It is certain that democritium is virtually nonexistent on Earth, but giving its extremely long half-life of 84 billion years, democritium should exist primordially on Earth. Democritium can only be made naturally in tiny amounts by biggest supernovae or colliding neutron stars due to requirement of tremendous amount of energy. Additionally, this element can also be produced artificially in much larger quantities by advanced technological civilizations, making artificial democritium more abundant than natural democritium in the universe. This element exists plentifully in the universe at an estimated abundance of 4.60 × 10−14 by mass, amounting to 1.54 × 1039 kilograms or nearly a billion Suns worth of this element, making it the most abundant transmoscovium element in the universe.
To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize democritium. To synthesize most stable isotopes of democritium, nuclei of a couple lighter elements must be fused together, and right amount of neutrons must be seeded. This operation would be very difficult since it requires vast amounts of energy. Here's couple of example equations in the production of the most stable isotope 326Dm.
There had been couple of failed attempts to synthesize democritium without enriching it with neutrons. In the near future, democritium shall successfully be made here on Earth.
Claimed discovery Edit
In April 2008, a group led by Amnon Marinov at the Hebrew University of Jerusalem claimed to have found atoms of democritium in naturally occurring thorium deposits at between 10−11 and 10−12 times as abundant as thorium. However, further experiments found that this discovery was spurious.
Democritium can be used in a variety of ways due to its nuclear stability. Like most metals, democritium can form alloys with other metals to improve durability, strength, and resist corrosion.