Symbol My
Atomic number 135
Pronunciation /'mī•yər•ē•(y)üm/
Named after Lothar Meyer
Name in Saurian Moøohaim (Mø)
Systematic name Untripentium (Utp)
Location on the periodic table
Period 8
Family Meyerium family
Series Lavoiside series
Coordinate 5g15
Element left of Meyerium Arrhenium
Element right of Meyerium Cavendishium
Atomic properties
Subatomic particles 504
Atomic mass 372.0840 u, 617.8599 yg
Atomic radius 159 pm, 1.59 Å
Covalent radius 175 pm, 1.75 Å
van der Waals radius 176 pm, 1.76 Å
Nuclear properties
Nucleons 369 (135 p+, 234 no)
Nuclear ratio 1.73
Nuclear radius 8.57 fm
Half-life 10.686 min
Decay mode Spontaneous fission
Decay product Various
Electronic properties
Electron notation 135-8-23
Electron configuration [Og] 5g9 6f4 8s2 8p2
Electrons per shell 2, 8, 18, 32, 41, 22, 8, 4
Oxidation states +3, +4, +5
(a mildly basic oxide)
Electronegativity 1.35
First ionization energy 646.8 kJ/mol, 6.703 eV
Electron affinity −120.0 kJ/mol, −1.243 eV
Physical properties
Bulk properties
Molar mass 372.084 g/mol
Molar volume 69.951 cm3/mol
Density 5.319 g/cm3
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
Magnetic ordering Paramagnetic
Crystal structure Body-centered cubic
Color Turquoish gray
Phase Solid
Thermal properties
Melting point 920.45 K, 1656.80°R
647.30°C, 1197.13°F
Boiling point 1720.23 K, 3096.42°R
1447.08°C, 2636.75°F
Liquid range 799.79 K, 1439.62°R
Liquid ratio 1.87
Triple point 920.45 K, 1656.82°R
647.30°C, 1197.15°F
@ 1.4940 Pa, 0.011206 torr
Critical point 3772.95 K, 6791.31°R
3499.80°C, 6331.64°F
@ 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)
Abundance in the universe
By mass Relative: 5.48 × 10−30
Absolute: 1.84 × 1023 kg
By atom 3.87 × 10−31

Meyerium is the provisional non-systematic name of an undiscovered 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.

Atomic properties Edit

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.

Isotopes Edit

Like every other element heavier than lead, meyerium has no stable isotopes. The longest-lived 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.

My → 282
Hs + 59
Co + 28 1

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.

Chemical properties and compounds Edit

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).

Physical properties Edit

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).

Occurrence Edit

It is almost certain that chadwickium doesn't exist on Earth at all, but it is believe to barely exist somewhere in the universe due to its very short lifetime. Every element heavier than iron can only naturally be produced 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 be produced by advanced technological civilizations, virtually accounting for all of its abundance in the universe. An estimated abundance of meyerium in the universe by mass is 5.48 × 10−30, which amounts to 1.84 × 1023 kilograms.

Synthesis Edit

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 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, 369My.

Po + 123
Sb + 38 1
n → 369
Am + 90
Zr + 36 1
n → 369
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 Ts Og
8 Nw G Ls Dm Ms T Dt Mw Pk By Bz Fn Dw To Pl Ah My Cv Fy Chd A Ed Ab Bu 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
9 Me Jf Ul Gr Mr Arm Hy Ck Do Ib Eg Af Bhz Me Zm Qtr Bhr Cy Gt Lp Pi Ix El Sv Sk Abr Ea Sp Ws Sl Jo Bl Et Ci Ht Bp Ud It Yh Jp Ha Vi Gk L Ko Ja Ph Gv Dc Bm Jf Km Oc Lb
10 Io Ly