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Abeggium (143Ab)
Pronunciation /'ä•be•gē•(y)üm/
Name in Saurian Urowwaim (Ur)
Systematic name Unquadtrium (Uqt)
Location on the periodic table
Period 8
Coordinate 6f3
Above element Protactinium (91Pa)
Below element ––
Previous element Butlerovium (142Bu)
Next element Scheelium (144Sh)
Family Praseodymium family
Series Dumaside series
Atomic properties
Atomic mass 394.2679 u, 654.6972 yg
Atomic radius 145 pm, 1.45 Å
Van der Waals radius 189 pm, 1.89 Å
Subatomic particles 534
Nuclear properties
Nucleons 391 (143 p+, 248 n0)
Nuclear ratio 1.73
Nuclear radius 8.74 fm
Half-life 26.244 s
Electronic properties
Electron notation 143-8-24
Electron configuration [Mc] 5g17 6f2 7d2 8s2 8p2
2, 8, 18, 32, 49, 20, 10, 4
Oxidation states +1, +3
(mildly basic oxide)
Electronegativity 1.78
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
Physical properties
Bulk properties
Molar mass 394.268 g/mol
Molar volume 51.998 cm3/mol
Density 7.582 g/cm3
Atomic number density 1.16 × 1022 cm−3
Average atomic separation 442 pm, 4.42 Å
Speed of sound 2869 m/s
Magnetic ordering Paramagnetic
Crystal structure Face centered cubic
Color Gray
Phase Solid
Melting point 655.59 K, 382.44°C
720.40°F, 1180.07°R
Boiling point 2904.24 K, 2631.09°C
4767.97°F, 5227.64°R
Liquid range 2248.65 K/°C, 4047.57°F/°R
Liquid ratio 4.43
Triple point 655.34 K, 382.19°C
719.95°F, 1179.62°R
@ 78.914 fPa, 5.9191 × 10−16 torr
Critical point 5322.62 K, 5049.47°C
9121.04°F, 9580.71°R
@ 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.

Properties Edit

Physical Edit

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.

Atomic Edit

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).

Abeggium has the atomic radius of 155 picometers, identical in value to lithium and masses 394.3 daltons, twice as heavy as gold atom.

Isotopes Edit

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.

Ab → 202
Hg + 153
I + 36 1

The most stable abeggium isomer is 388m2Ab with a half-life of 417 milliseconds, 1.6% of the most stable isotope. 388m2Ab decays either by isomeric transition or fission.

Chemical Edit

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.

Compounds Edit

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.

Pb + 145
Pm + 40 1
n → 391
Mt + 80
Se + 24 1
n → 391
Periodic table
1 H He
2 Li Be B C N O F Ne
3 Na Mg Al Si P S Cl Ar
9 Ps Hb Kf Bn Ju Hm Bs Rs
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