|Name in Saurian|| Moøohaim (Mø)|
|Systematic name|| Untripentium (Utp)|
|Location on the periodic table|
|Previous element||Arrhenium (134Ah)|
|Next element||Cavendishium (136Cv)|
|Atomic mass||372.0840 u, 617.8599 yg|
|Atomic radius||159 pm, 1.59 Å|
|Van der Waals radius||176 pm, 1.76 Å|
|Nucleons||369 (135 p+, 234 n0)|
|Nuclear radius||8.57 fm|
|Electron configuration|| [Mc] 5g9 6f4 8s2 8p2|
2, 8, 18, 32, 41, 22, 8, 4
|Oxidation states|| +3, +4, +5|
(mildly basic oxide)
|First ionization energy||646.8 kJ/mol, 6.703 eV|
|Electron affinity||−120.0 kJ/mol, −1.243 eV|
|Covalent radius||175 pm, 1.75 Å|
|Molar mass||372.084 g/mol|
|Molar volume||69.951 cm3/mol|
|Atomic number density|| 1.62 × 1021 g−1|
8.61 × 1021 cm−3
|Average atomic separation||488 pm, 4.88 Å|
|Speed of sound||2338 m/s|
|Crystal structure||Body centered cubic|
|Melting point|| 920.45 K, 1656.80°R|
|Boiling point|| 1720.23 K, 3096.42°R|
|Liquid range||799.79 K, 1439.62°R|
|Triple point|| 920.45 K, 1656.82°R|
@ 1.4940 Pa, 0.011206 torr
|Critical point|| 3772.95 K, 6791.31°R|
@ 64.5721 MPa, 637.279 atm
|Heat of fusion||9.842 kJ/mol|
|Heat of vaporization||165.884 kJ/mol|
|Heat capacity|| 0.05797 J/(g•K), 0.10435 J/(g•°R)|
21.571 J/(mol•K), 38.827 J/(mol•°R)
|Universe (by mass)|| Relative: 5.48 × 10−32|
Absolute: 1.84 × 1021 kg
Meyerium is the fabricated name of a theoretical element with the symbol My and atomic number 135. Meyerium was named in honor of Lothar Meyer (1830–1895), who helped Dmitri Mendeleev to draw the first periodic table of the elements in 1869. This element is known in the scientific literature as untripentium (Utp), or simply element 135. Meyerium is the fifteenth element of the lavoiside series and located in the periodic table coordinate 5g15.
Meyerium is a turquoish gray metal with a density of 5.32 g/cm3 and molar volume of 70 cm3/mol. It forms body centered cubic crystal structure with the average atomic separation of 495 pm. In one cubic centimeter of meyerium, there are 8.6 sextillion atoms. The sound travels through the thin rod of metal at 2338 m/s. Like most elements, meyerium is paramagnetic, meaning this metal is attracted by externally applied magnetic field.
Solid meyerium melts to a liquid at 1657°R (647°C), absorbing 10 kJ/mol in the process, and then to gas at 3096°R (1447°C), aborbing 166 kJ/mol. So its liquid state spans a range of 1440°R (800°C).
Meyerium contains 369 nucleons that make up the nucleus (135 protons, 234 neutrons) as well as 135 electrons in the orbitals surrounding the nucleus. The periodic table expects that meyerium should have 15 electrons in the g-orbital, but there is only nine due to smearing of the orbitals between g-, f-, d-, and p-orbitals. The f-orbital contains four electrons while p-orbital contains two.
Like every other element heavier than lead, meyerium has no stable isotopes. The most stable isotope is 369My with a half-life (t½) of 10.7 minutes. It undergoes spontaneous fission, splitting into two lighter nuclei plus neutrons like the example.
The second longest-lived isotope, 373My, has a fission half-life of 2.79 minutes. The rest have half-lives of less than 30 seconds. Meyerium has meta states, the longest is 369mMy with a half-life of 2.3 seconds, mainly undergoing fission while sometimes undergoing isomeric transition.
Based on its electronegativity and ionization energy, meyerium is sort of reactive. It tarnishes slowly in the air and dissolves readily in water to form a base. Ions of meyerium are My3+, My4+, My5+, with My5+ is the most stable, though in aqueous solutions, My5+ is the least stable.
Meyerium(V) oxide (My2O5) is a dark green crystalline solid, and meyerium hydroxide (My(OH)5) is a purple solution. Meyerium pentafluoride (MyF5) is a peach ionic solid, meyerium pentachloride (MyCl5) is a pink ionic solid, meyerium pentabromide (MyBr5) is a tan crystalline solid, and meyerium pentaiodide (MyI5) is a yellow crystalline solid. Meyerium can also form trihalides and tetrahalides using less common oxidation states as well as sesquioxide and dioxide. Meyerium sesquisulfide (My2S3) is a reddish brown (maroon) powder forms when meyerium reacts with sulfur suboxide or sulfur trioxide. Meyerium(IV) carbide (MyC) is a gray refractory solid forms when meyerium reacts with burning coal.
Organomeyerium is an organic compound of meyerium. Some examples include trimethylmeyerium ((CH3)3My), meyerocene diiodide ((C5H5)4MyI2), and meyerose (C18H16My8).
Occurrence and synthesis Edit
It is certain that meyerium is virtually nonexistent on Earth, and is extremely rare in the universe. Since every element heavier than lithium were produced by stars, then meyerium must be produced in stars, and then thrown out into space by exploding stars. But it is virtually 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 practically be made by advanced technological civilizations. An estimated abundance of meyerium in the universe by mass is 5.48 × 10−32, which amounts to 1.84 × 1021 kilograms.
To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize meyerium. To synthesize most stable isotopes of meyerium, 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. Here's couple of example equations in the production of the most stable isotope, 369My.