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Avogadrium (149Av)
Pronunciation /'av•ō•ga•drē•(y)üm/
Name in Saurian Ulewuthaim (Ul)
Systematic name Unquadennium (Uqe)
Location on the periodic table
Period 8
Coordinate 6f9
Above element Berkelium (97Bk)
Below element ––
Previous element Faradium (148Fa)
Next element Schrodium (150So)
Family Terbium family
Series Dumaside series
Atomic properties
Atomic mass 416.4535 u, 691.5372 yg
Atomic radius 127 pm, 1.27 Å
Van der Waals radius 173 pm, 1.73 Å
Subatomic particles 562
Nuclear properties
Nucleons 413 (149 p+, 264 n0)
Nuclear ratio 1.77
Nuclear radius 8.90 fm
Half-life 41.793 ms
Electronic properties
Electron notation 149-8-24
Electron configuration [Mc] 5g18 6f6 7d3 8s2 8p2
2, 8, 18, 32, 50, 24, 11, 4
Oxidation states 0, +1, +2, +3
(weakly basic oxide)
Electronegativity 2.07
First ionization energy 868.0 kJ/mol, 8.996 eV
Electron affinity 71.6 kJ/mol, 0.742 eV
Covalent radius 142 pm, 1.42 Å
Physical properties
Bulk properties
Molar mass 416.453 g/mol
Molar volume 28.090 cm3/mol
Density 14.825 g/cm3
Atomic number density 1.45 × 1021 g−1
2.14 × 1022 cm−3
Average atomic separation 360 pm, 3.60 Å
Speed of sound 5059 m/s
Magnetic ordering Paramagnetic
Crystal structure Face centered cubic
Color Yellow
Phase Solid
Melting point 688.25 K, 1238.85°R
415.10°C, 679.18°F
Boiling point 4700.20 K, 8460.36°R
4427.05°C, 8000.69°F
Liquid range 4011.95 K, 7321.51°R
Liquid ratio 6.83
Triple point 688.15 K, 1238.67°R
415.00°C, 679.00°F
@ 8.4910 × 10−14 aPa, 6.3688 × 10−34 torr
Critical point 14006.59 K, 25211.86°R
13733.44°C, 24752.19°F
@ 178.9003 MPa, 1765.614 atm
Heat of fusion 6.160 kJ/mol
Heat of vaporization 432.598 kJ/mol
Heat capacity 0.05738 J/(g•K), 0.10328 J/(g•°R)
23.895 J/(mol•K), 43.011 J/(mol•°R)
Universe (by mass) Relative: 9.54 × 10−38
Absolute: 3.20 × 1015 kg

Avogadrium is the fabricated name of a hypothetical element with the symbol Av and atomic number 149. Avogadrium was named in honor of Amedeo Avogadro (1776–1856), who developed the molecular theory, determined the number of particles in one mole of substance (known as Avogadro constant), and contributed gas law. This element is known in the scientific literature as unquadennium (Uqe), eka-berkelium, or simply element 149. Avogadrium is the ninth member of the dumaside series, found in the third row of f-block (below terbium and berkelium); this element is located in the periodic table coordinate 6f9.

Properties Edit

Physical Edit

Avogadrium is a bright, vivid yellow metal that is malleable and ductile. Avogadrium(III) ions fluorescences in brilliant red light at 636 nm. The molar mass is 41649 g/mol while its molar volume is 28111 cm3/mol; dividing molar mass and volume yields a density of 1456 g/cm3. Its speed of sound is 5059 m/s and its lattice is in the form of face centered cubic.

Avogadrium has the widest liquid range of any element. Liquid avogadrium ranges from 1239°R (779°F) (melting point) to roughly 8460°R (8001°F) (boiling point). It has the second widest liquid range (7322°R) and the third highest liquid ratio (6.83) of any element. A reason why the liquid range and quotient is so wide is because of an exceptionally low vapor pressure despite its low melting point, due to strong metallic bonding of liquid metal. Due to this, the amount of energy needed to convert from liquid to gas during boiling (called heat of vaporization) is merely 70 times greater than energy needed to convert from solid to liquid during melting (called heat of fusion), which is 3½ times the average ratio of 20. Its triple point, a point on the phase diagram where solid, liquid, and gas coexist in equilibrium, is at a temperature 0.18°R lower than its melting point but at near-zero pressure of 8.49 × 10−32 Pa.

Atomic Edit

Avogadrium atom masses 416.45 daltons and sizes 152 pm in radius. It has 562 component particles, 73% of all components lie in a region only approximately 114000 the radius of the atom, which is the atomic nucleus with the same value of charge as its atomic number. Outside the nucleus, the electron notation is 149-8-24, meaning there are 149 electrons in 8 shells and 24 orbitals.

Isotopes Edit

Like every other element heavier than lead, avogadrium has no stable isotopes. The most stable isotope is 413Av with a fission half-life of 4145 milliseconds. Fission means splitting into two or three lighter nuclei plus neutrons like the example.

Av → 192
Os + 181
Ta + 40 1
Av → 209
Bi + 130
Te + 28
Si + 46 1

Like every element heavier than calcium, avogadrium has metastable isomers. The longest lived isomer is 413m1Av with a half-life of 5.6 milliseconds. The most stable isomer is shorter lived than the most stable ground state isotope, unlike a lot of elements heavier than arrhenium.

Chemical Edit

Because of the smearing out the orbitals with filled g-orbital and partially filled f-orbital, avogadrium is an unreactive element, meaning it does not display eka-berkelium properties despite the relative locations on the periodic table. As a result, avogadrium is corrosion-resistent, either in air, water, or acids, though slightly soluble in acids. The element displays a +3 oxidation state like berkelium, as well as +1 and rarely +2. Av3+ is the only stable ion in aqueous solutions. This ion forms purple solution in hydrochloric acid, but crimson in carbonic acid.

Compounds Edit

Despite its unreactivity, avogadrium has several notable compounds as well as organoavogadrium compounds. Avogadrium monofluoride (AvF) and trifluoride (AvF3) are both white ionic salts appearing like sodium chloride (NaCl). AvCl is a sky blue ionic or crystalline salt while AvCl3 is white. If we put avogadrium in the flame for a few minutes, it first melts to a thick yellow liquid quickly and then tarnishes and solidifies to a brittle brown oxide Av2O, which with further exposure to the flame darkens this substance even more as it oxidizes to Av2O3, which is brownish black and crumbly.

Other than oxides and halides, there are other avogadrium compounds of note. Av2S is a red powder that is soluble in water. Av(SiO2)2 is a gray crystalline solid. Av(PF3)4 is a white crystalline solid that dephosphorizes in salt water to give AvF3, phosphoric acid (H3PO4), PF3, and few other products.

Av(PF3)4 + 6 H2O + 2 NaCl → AvF3 + H3PO4 + 3 PF3 + 2 NaOH + 2 HCl + 2.5 H2

Organoavogadrium compounds include AvHCO2 (avogadrium formate), AvCH3CO2 (avogadrium acetate), and AvCH3 (methylavogadrium or avogadrium methanide).

Occurrence and synthesis Edit

It is almost certain that avogadrium 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 avogadrium 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 avogadrium in the universe by mass is 9.54 × 10−38, which amounts to 3.20 × 1015 kilograms.

To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize avogadrium. To synthesize most stable isotopes of avogadrium, 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, 413Av.

Rn + 152
Eu + 39 1
n → 413
Sg + 98
Tc + 39 1
n → 413
Periodic table
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 Bc Fl Lz Lv J Mc
8 Nw Gl * Du Bu Ab Sh Hi Da Bo Fa Av So Hr Wt Dr Le Vh Hk Ke Ap Vw Hu Fh Ma Kp Gb
9 Ps Hb Kf Bn Ju Hm Bs Rs
* Ls Dm Ms Ts Dt Mw Pk By Bz Fk Dw To Pl Ah My Cv Fy Ch An Ed

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