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Symbol Ab
Atomic number 141
Pronunciation /'ä•be•gē•(y)üm/
Named after Richard Abegg
Name in Saurian Urowwaim (Ur)
Systematic name Unquadunium (Uqu)
Location on the periodic table
Period 8
Family Abeggium family
Series Lavoiside series
Coordinate 5g21
Element left of Abeggium Edisonium
Element right of Abeggium Butlerovium
Atomic properties
Subatomic particles 526
Atomic mass 388.2176 u, 644.6504 yg
Atomic radius 141 pm, 1.41 Å
Covalent radius 164 pm, 1.64 Å
van der Waals radius 170 pm, 1.70 Å
Nuclear properties
Nucleons 385 (141 p+, 244 no)
Nuclear ratio 1.73
Nuclear radius 8.69 fm
Half-life 1.0410 ms
Decay mode Spontaneous fission
Decay product Various
Electronic properties
Electron notation 141-8-24
Electron configuration [Og] 5g15 6f2 7d2 8s2 8p2
Electrons per shell 2, 8, 18, 32, 47, 20, 10, 4
Oxidation states +2, +3, +4, +5
(a mildly basic oxide)
Electronegativity 1.63
First ionization energy 687.6 kJ/mol, 7.127 eV
Electron affinity 61.2 kJ/mol, 0.635 eV
Physical properties
Bulk properties
Molar mass 388.218 g/mol
Molar volume 57.328 cm3/mol
Density 6.772 g/cm3
Atomic number density 1.55 × 1021 g−1
1.05 × 1022 cm−3
Average atomic separation 457 pm, 4.57 Å
Speed of sound 2650 m/s
Magnetic ordering Paramagnetic
Crystal structure Body-centered cubic
Color Grayish white
Phase Solid
Thermal properties
Melting point 921.89 K, 1659.41°R
648.74°C, 1199.74°F
Boiling point 1979.28 K, 3562.71°R
1706.13°C, 3103.04°F
Liquid range 1057.39 K, 1903.30°R
Liquid ratio 2.15
Triple point 921.87 K, 1659.36°R
648.72°C, 1199.69°F
@ 83.388 mPa, 6.2546 × 10−4 torr
Critical point 3560.30 K, 6408.53°R
3287.15°C, 5948.86°F
@ 18.5962 MPa, 183.530 atm
Heat of fusion 8.903 kJ/mol
Heat of vaporization 190.328 kJ/mol
Heat capacity 0.05577 J/(g•K), 0.10039 J/(g•°R)
21.652 J/(mol•K), 38.974 J/(mol•°R)
Abundance in the universe
By mass Relative: 3.34 × 10−32
Absolute: 1.12 × 1021 kg
By atom 2.26 × 10−33

Abeggium is the provisional non-systematic name of an undiscovered element with the symbol Ab and atomic number 141. Abeggium was named in honor of Richard Abegg (1869–1910), who pioneered valence theory. This element is known in the scientific literature as unquadunium (Uqu) or simply element 141. Abeggium is the twenty-first element of the lavoiside series and located in the periodic table coordinate 5g21.

Atomic properties Edit

Despite abeggium is the first f-block element of period 8, the electrons are still filling the g-orbital, it now needs three more electrons to be completed. The g-orbital has 15 electrons out of 18. Despite this, there is one more electron in the f-orbital than what the periodic table expects. The atomic nucleus is composed of 385 nucleons (141 protons, 244 neutrons).

Isotopes Edit

Like every other trans-lead elements, abeggium has no stable isotopes. The longest-lived isotope is 385Ab with a brief half-life of 1 millisecond, undergoing spontaneous fission like the example.

Ab → 208
Po + 139
La + 38 1

Abeggium also has meta states, several are much longer-lived than the most stable ground state isotope. The longest-lived meta state is 388m4Ab with a half-life of 4.5 hours, 386m2Ab has a half-life of 13.7 minutes, and 389mAb with a half-life of 3.8 seconds.

Chemical properties and compounds Edit

Abeggium's most common oxidation state is +3, but it also shows a +4 common state as well as less common +1 and +2. In aqueous solutions, +2 (green) and +3 (grayish black) oxistates are common, such as AbCO3 (+2), Ab(NO3)3 (+3), AbSO3 (+2), and AbPO4 (+3). +4 state is most commonly found in chalcides, halides, and oxyhalides, such as AbO2, AbF4, and AbOCl2.

AbF3 is an aqua green crystalline solid which can be fluoridized to AbF4 with hydrofluoric acid, which is a sky blue crystals. AbCl3 is a lime green ionic solid which can be chloridized to AbCl4 with hydrochloric acid or with chlorine gas, which is a sea green ionic salt. If pure element is exposed to air for days, Ab2O3 forms as a black film and the film would later be oxidized to AbO2, which is identical in appearance to the initial.

AbBr3 is a brown ionic salt that is in stark contrast with AbBr4, which is a dark green crystalline solid. AbI3 is a yellowish orange while AbI4 is reddish purple. Since astatine is very radioactive with an eight-hour half-life, astatides of abeggium, AbAt3 and AbAt4, would transform to AbBi and Ab3Bi4 through alpha decay of astatine. These bismuthides are highly unstable and would readily decompose. Tennessides of abeggium, AbTn3 and AbTn4, would be much longer lasting than astatides, since tennessine, an element below astatine, has a half-life of over seven years compared to just eight hours for astatine.

Since +3 is the most common oxidation state of abeggium, it can form binary compounds with pnictides, such as AbN (black), AbP (bluish black), AbAs (greenish brown), and AbSb (maroon). AbBi, just mentioned as unstable, is a brownish black solid. Stable abeggium icosagides are AbB and AbAl. At +4 state, it can form binary compounds with carbon, silicon, and germanium to make refractive solids along with AbB and AbAl.

Organoabeggium compounds can also be made, meaning it can form complex compounds involving carbon, hydrogen, radicals, and others. Abeggium in organoabeggium most commonly carries either +3 or +2 oxidation states, though +4 state is very useful because it can bond to four carbon atoms. Examples of organoabeggium are triethylabeggium ((C2H5)3Ab) and abeggium acetate (Ab(CH3CO2)2).

Physical properties Edit

Abeggium is a grayish white metal that is malleable and ductile that shows luster. Abeggium's density is about 6.77 g/cm3, similar to antimony and cerium. It has a body faced cubic crystal structure, but when cooled to −138°F it changes to face-centered cubic. It is paramagnetic with the Curie point of −425°F, at that temperature it becomes antiferromagnetic when cooled.

Abeggium is solid at room temperature (77°F) with the melting point of 1200°F and boiling point 3103°F, corresponding to its liquid range of 1903°F and liquid ratio of 2.15 (only calculated when converted to Rankine or Kelvin scale). One mole of abeggium requires 39 Joules of energy to heat by 1°F.

Occurrence Edit

It is almost certain that abeggium doesn't exist on Earth at all, but it is believe to barely exist somewhere in the universe due to its brief lifetime. Every element heavier than iron can only naturally be produced by exploding stars. But it is likely 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 can only be produced by advanced technological civilizations, virtually accounting for all of its abundance in the universe. An estimated abundance of abeggium in the universe by mass is 3.34 × 10−32, which amounts to 1.12 × 1021 kilograms.

Synthesis Edit

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 impossible using current technology since it requires a tremendous amount of energy, thus its cross section would be so low that it is beyond the technological limit. Even if synthesis succeeds, this resulting element would immediately undergo fission. Here's couple of example equations in the synthesis of the most stable isotope, 385Ab.

Hg + 145
Pm + 38 1
n → 385
Np + 114
Cd + 34 1
n → 385
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 H He
2 Li Be B C N O F Ne
3 Na Mg Al Si P S Cl Ar
4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6 Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7 Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Tn Og
8 Nw G * Du Sh Hb Da Bo Fa Av So Hr Wt Dr Le Vh Hk Ke Ap Vw Hu Fh Ma Kp Gb Bc Hi Kf Bn J Hm Bs Rs
* Ls Dm Ms Ts Dt Mw Pk By Bz Fn Dw To Pl Ah My Cv Fy Ch A Ed Ab Bu

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