|Name in Saurian|| Urowwaim (Ur)|
|Systematic name|| Unquadtrium (Uqt)|
|Location on the periodic table|
|Above element||Protactinium (91Pa)|
|Previous element||Butlerovium (142Bu)|
|Next element||Scheelium (144Sh)|
|Atomic mass||394.2679 u, 654.6972 yg|
|Atomic radius||145 pm, 1.45 Å|
|Van der Waals radius||189 pm, 1.89 Å|
|Nucleons||391 (143 p+, 248 n0)|
|Nuclear radius||8.74 fm|
|Electron configuration|| [Mc] 5g17 6f2 7d2 8s2 8p2|
2, 8, 18, 32, 49, 20, 10, 4
|Oxidation states|| +1, +3|
(mildly basic oxide)
|First ionization energy||739.0 kJ/mol, 7.659 eV|
|Electron affinity||87.0 kJ/mol, 0.902 eV|
|Covalent radius||157 pm, 1.57 Å|
|Molar mass||394.268 g/mol|
|Molar volume||51.998 cm3/mol|
|Atomic number density||1.16 × 1022 cm−3|
|Average atomic separation||442 pm, 4.42 Å|
|Speed of sound||2869 m/s|
|Crystal structure||Face centered cubic|
|Melting point|| 655.59 K, 382.44°C|
|Boiling point|| 2904.24 K, 2631.09°C|
|Liquid range||2248.65 K/°C, 4047.57°F/°R|
|Triple point|| 655.34 K, 382.19°C|
@ 78.914 fPa, 5.9191 × 10−16 torr
|Critical point|| 5322.62 K, 5049.47°C|
@ 21.2552 MPa, 209.774 atm
|Heat of fusion||6.950 kJ/mol|
|Heat of vaporization||275.565 kJ/mol|
|Heat capacity|| 0.05062 J/g/K, 0.09112 J/g/°R|
19.959 J/mol/K, 35.926 J/mol/°R
|Universe (by mass)|| Relative: 2.33 × 10−33|
Absolute: 7.82 × 1019 kg
Abeggium is the fabricated name of a hypothetical element with the symbol Ab and atomic number 143. Abeggium was named in honor of Richard Abegg (1869–1910), who pioneered valence theory. This element is known in scientific literature as unquadtrium (Uqt), eka-protactinium, or simply element 143. Abeggium is the third member of the dumaside series, found in the third row of f-block (below praseodymium and protactinium); this element is located in periodic table coordinate 6f3.
Like many metals, abeggium is gray that shows only a dull luster. Its molar mass is 394 g/mol while its molar volume is 52.5 cm3/mol, corresponding to its density of 7.58 g/cm3. The speed of sound through the thin rod of metal is 2869 m/s, which is slower than through an average element.
Its liquid state ranges from 656 K to 2904 K, quotient between these values would provide a relatively high liquid ratio of 4.43, meaning its boiling point is 4.43 times hotter than its melting point. However it requires 40 times more energy to boil it than melt it.
Abeggium has the mass number 391, 248 more than its atomic number, corresponding that there are 248 neutrons, and 143 protons that make up the nucleus. Despite it is the third element of the f-block series, there are only two electrons in the f-orbital and didn't add it prior to this element, and the g-orbital needs one more electron to complete its orbital (17/18).
Like every other elements heavier than lead, abeggium has no stable isotopes. The most stable isotope is 391Ab with a half-life (t½) of just 26 seconds. It undergoes spontaneous fission, splitting into two lighter nuclei as well as neutrons like the following example.
Based on the element's location on the periodic table, abeggium should have similar chemical properties to the above element protactinium. The common oxidation states are +1 and +3, compared to +5 for protactinium, and has the electronegativity of 1.78, compared to 1.48 for protactinium. So this makes abeggium less reactive than its lighter homologue. So unlike protactinium, it does not corrode when exposed to air when oxygen is plentiful. It is insoluble in water but slightly soluble in carbon disulfide and mineral acids.
Abeggium reacts most readily with free halogens to form very colorful ionic halides, such as fluorine to form AbF or Ab3 (red and orange respectively), chlorine to form AbCl or AbCl3 (blue and green respectively), bromine to form AbBr or AbBr3 (purple and pink respectively), iodine to form AbI or AbI3 (brown and peach respectively). At higher temperatures, it can combine with astatine to form AbAt or AbAt3 (yellow and brown respectively), jointium to form AbJ or AbJ3 (black and white respectively), and bunsenium to form AbBu or AbBu3 (dun and black respectively). Abeggium tarnishes in the air to form Ab2O (light gray) or Ab2O3 (gray) and with nitrogen at high temperatures to form Ab3N (dark gray) or AbN (black).
Occurrence and synthesis Edit
It is almost certain that abeggium doesn't exist on Earth at all, but it is believed to exist somewhere in the universe, at least in very tiny amounts. Since every element heavier than lithium were produced by stars, then abeggium 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 heavy element. Instead, this element virtually can only be made by advanced technological civilizations. An estimated abundance of abeggium in the universe by mass is 2.33 × 10−36, which amounts to 7.82 × 1016 kilograms.
To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize abeggium. To synthesize most stable isotopes of abeggium, 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 vast amounts of energy and even if nuclei of this element were produced would quickly decay due to its short half-life. Here's couple of example equations in the production of the most stable isotope 391Ab.