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Symbol Ed
Atomic number 140
Pronunciation /'e•dis•in•ē•(y)üm/
Named after Thomas Edison
Name in Saurian Otajedaim (Ot)
Systematic name Unquadnilium (Uqn)
Location on the periodic table
Period 8
Family Edisonium family
Series Lavoiside series
Coordinate 5g20
Element left of Edisonium Astonium
Element right of Edisonium Abeggium
Atomic properties
Subatomic particles 519
Atomic mass 382.1664 u, 634.6022 yg
Atomic radius 143 pm, 1.43 Å
Covalent radius 169 pm, 1.69 Å
van der Waals radius 167 pm, 1.67 Å
Nuclear properties
Nucleons 379 (140 p+, 239 no)
Nuclear ratio 1.71
Nuclear radius 8.65 fm
Half-life 11.044 min
Decay mode Cluster decay
Decay product 339Ts
Electronic properties
Electron notation 140-8-24
Electron configuration [Og] 5g14 6f3 7d1 8s2 8p2
Electrons per shell 2, 8, 18, 32, 46, 21, 9, 4
Oxidation states +2, +4, +5, +6
(a mildly basic oxide)
Electronegativity 1.54
First ionization energy 678.5 kJ/mol, 7.032 eV
Electron affinity 18.6 kJ/mol, 0.193 eV
Physical properties
Bulk properties
Molar mass 382.166 g/mol
Molar volume 43.675 cm3/mol
Density 8.750 g/cm3
Atomic number density 1.58 × 1021 g−1
1.38 × 1022 cm−3
Average atomic separation 417 pm, 4.17 Å
Speed of sound 3575 m/s
Magnetic ordering Paramagnetic
Crystal structure Hexagonal
Color Dark gray
Phase Solid
Thermal properties
Melting point 347.11 K, 624.80°R
73.96°C, 165.13°F
Boiling point 811.39 K, 1460.50°R
538.24°C, 1000.83°F
Liquid range 464.28 K, 835.70°R
Liquid ratio 2.34
Triple point 347.11 K, 624.79°R
73.96°C, 165.12°F
@ 76.939 μPa, 5.7709 × 10−7 torr
Critical point 2101.21 K, 3782.17°R
1828.06°C, 3322.50°F
@ 609.5969 MPa, 6016.272 atm
Heat of fusion 4.889 kJ/mol
Heat of vaporization 95.621 kJ/mol
Heat capacity 0.05295 J/(g•K), 0.09531 J/(g•°R)
20.235 J/(mol•K), 36.423 J/(mol•°R)
Abundance in the universe
By mass Relative: 7.48 × 10−30
Absolute: 2.51 × 1023 kg
By atom 5.14 × 10−31

Edisonium is the provisional non-systematic name of an undiscovered element with the symbol Ed and atomic number 140. Edisonium was named in honor of Thomas Edison (1847–1931), who patented electricity and invented electric light bulb, phonograph, and the motion picture camera. This element is known in the scientific literature as unquadnilium (Uqn) or simply element 140. Edisonium is the twentieth element of the lavoiside series and located in the periodic table coordinate 5g20.

Atomic properties Edit

Edisonium's nucleus is comprised of 379 nucleons, hence its mass number. Since this element has the atomic number 140, there must be 140 protons in the nucleus. There are also 239 neutrons, determined by substracting the number of nucleons (379) by its atomic number (140). Atoms are neutral, so there must be 140 electrons in the cloud. There are eight energy levels hence it is a period 8 element. Even though edisonium is the last of the 20-element g-block series, the g-orbital is not completed because electrons are found straying in other orbitals due to orbitals being crammed together causing differences of ground state energies to be small.

Edisonium has the atomic mass of 382.17 daltons, 99.98% of which is located in the nucleus. Its atomic radius, from center of nucleus to outermost shell, is 143 picometers, although its imaginery radius of an atom as a hard sphere like a ball, planet, and star, called its van der Waals radius, is 167 picometers, meaning its boundary is 24 pm further out than its outermost orbital.

Isotopes Edit

Like every other element heavier than lead, edisonium has no stable isotopes. The longest-lived isotope is 379Ed with a half-life of 11 minutes. It undergoes cluster decay about 68% of the times, emitting 12C and 20Ne to form 339Ts plus 24 neutrons. All other isotopes have half-lives less than 45 seconds, undergoing spontaneous fission. Edisonium has meta states, the longest-lived is much more brief than the longest-lived ground state like most elements, 0.2 seconds for 382mEd.

Chemical properties and compounds Edit

Edisonium has the Pauling scale electronegativity of over 1½ and first ionization of just over 7 eV, meaning this element has a fair chemical activity. As a pure metal, it slowly darkens when exposed to air and is slightly soluble in water. The metal exhibits +2, +4, +5, and +6 oxistates (+4 is much more common). Examples of compounds that exhibit +4 state of edisonium are EdF4 and EdO2, compound that exhibits +2 state is EdSiO3, compound that exhibits +5 state is Ed(NO3)5 and compounds that exhibit +6 state are EdF6 and EdO3. When dissolved in water, Ed2+ is orange while Ed4+ is pink. Edisonium can form complex ions, such as EdF4−
, Ed(CO3)4−
, and Ed2O2H3+.

EdF4 is an aquamarine ionic solid with the melting point of 343°F (432 K); EdCl4 is a pale blue ionic solid with the melting point of 578°F (562 K); EdBr4 is an aquamarine ionic solid with the melting point of 968°F (793 K); EdI4 is a purplish sky blue crystalline solid with the melting point of 786°F (692 K). EdO2 forms as a coating of metal when it exposes to air, which protects the metal from further oxidation. EdSO4 is an ionic salt obtained when edisonium reacts with less stable sulfates or sulfuric acid.

Compounds that exhibit +2 oxistate of edisonium are usually unstable. EdO is an unstable oxide obtained when EdO2 is heated with pressurized ozone (O3). EdO slowly decomposes at room temperature in the absence of oxygen into its constituents, but when in the presence of oxygen, EdO is quickly oxidized to EdO2. EdO2 hydrolyses in water to form EdO(OH)2, which decomposes by emitting oxygen to form Ed(OH)2.

2 EdO2 + 2 H2O → 2 EdO(OH)2 → 2 Ed(OH)2 + O2

EdF2 and EdCl2 are powerful oxidizers. When they react together in the presence of oxygen or water, it forms a double halide called edisonium chlorofluoride (EdClF), which in this compound +2 oxistate for edisonium is far more stable than +4 state. But when individual reactants react with oxygen or water, it forms edisonium oxyhalides EdOF2 and EdOCl2 while increasing oxidation state to +4 for edisonium.

Tetraphenyledisonium ((C6H5)4Ed) and the fluorine homologue tetrafluorophenyledisonium ((C6F5)4Ed) are organoedisonium, organic compounds of edisonium.

Physical properties Edit

Edisonium is a soft, dark gray metal that is slightly brittle. Its molar mass is 382 g/mol and its molar volume is 43.7 cm3/mol. Dividing molar mass by molar volume yields its molar density of 8.75 g/cm3. Molar density is well known simply as density. Edisonium atoms arrange to form hexagonal crystals and sound travel through the metal at a mediocre speed of 3575 m/s.

Edisonium has a low enough melting point to allow boiling water to melt this metal. Its melting point is 165°F (347 K), compared to 212°F (373 K) for the boiling point of water. The metal's boiling point is 1001°F (811 K), low enough for ordinary flames to vaporize this metal, which is 836°F (464 K) above its melting point. Correspondingly, the liquid range of the element is 4.64 times wider than the liquid range of water.

Occurrence Edit

It is almost certain that edisonium 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 edisonium in the universe by mass is 7.48 × 10−30, which amounts to 2.51 × 1023 kilograms or about 40% of Mars worth of this element in mass.

Synthesis Edit

To synthesize most stable isotopes of edisonium, 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. Here's couple of example equations in the synthesis of the most stable isotope, 379Ed.

Fr + 127
I + 29 1
n → 379
Db + 80
Br + 27 1
n → 379
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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