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Symbol Cv
Atomic number 136
Pronunciation /'kāv•in•dish•ē•(y)üm/
Named after Henri Cavendish
Name in Saurian Sulodtajxaim (Sl)
Systematic name Untrihexium (Uth)
Location on the periodic table
Period 8
Family Cavendishium family
Series Lavoiside series
Coordinate 5g16
Element left of Cavendishium Meyerium
Element right of Cavendishium Feynmanium
Atomic properties
Subatomic particles 509
Atomic mass 376.1178 u, 624.5582 yg
Atomic radius 152 pm, 1.52 Å)
Covalent radius 171 pm, 1.71 Å
van der Waals radius 174 pm, 1.74 Å
Nuclear properties
Nucleons 373 (136 p+, 237 no)
Nuclear ratio 1.74
Nuclear radius 8.60 fm
Half-life 4.5110 d
Decay mode Alpha decay
Decay product 369Ah.
Electronic properties
Electron notation 136-8-23
Electron configuration [Og] 5g10 6f4 8s2 8p2
Electrons per shell 2, 8, 18, 32, 42, 22, 8, 4
Oxidation states +4, +6
(a mildly basic oxide)
Electronegativity 1.33
First ionization energy 600.1 kJ/mol, 6.220 eV
Electron affinity 192.5 kJ/mol, 1.995 eV
Physical properties
Bulk properties
Molar mass 376.118 g/mol
Molar volume 63.813 cm3/mol
Density 5.894 g/cm3
Atomic number density 1.60 × 1021 g−1
9.44 × 1021 cm−3
Average atomic separation 473 pm, 4.73 Å
Speed of sound 2873 m/s
Magnetic ordering Paramagnetic
Crystal structure Hexagonal
Color Dark turquoish gray
Phase Solid
Thermal properties
Melting point 801.98 K, 1443.57°R
528.83°C, 983.90°F
Boiling point 1897.68 K, 3415.82°R
1624.53°C, 2956.15°F
Liquid range 1095.70 K, 1972.25°R
Liquid ratio 2.37
Triple point 801.97 K, 1443.54°R
528.82°C, 983.87°F
@ 230.75 mPa, 1.7308 × 10−4 torr
Critical point 3412.22 K, 6141.99°R
3139.07°C, 5682.32°F
@ 14.1969 MPa, 140.113 atm
Heat of fusion 7.749 kJ/mol
Heat of vaporization 171.561 kJ/mol
Heat capacity 0.05644 J/(g•K), 0.10159 J/(g•°R)
21.228 J/(mol•K), 38.211 J/(mol•°R)
Abundance in the universe
By mass Relative: 7.83 × 10−29
Absolute: 2.62 × 1024 kg
By atom 5.47 × 10−30

Cavendishium is the provisional non-systematic name of an undiscovered element with the symbol Cv and atomic number 136. Cavendishium was named in honor of Henri Cavendish (1731–1810), who discovered some of the most important elements in the periodic table such as hydrogen and nitrogen. This element is known in the scientific literature as untrihexium (Uth) or simply element 136. Cavendishium is the sixteenth element of the lavoiside series and located in the periodic table coordinate 5g16.

Atomic properties Edit

Cavendishium contains 136 electrons, identical to the number of protons in its nucleus, making this atom neutral. In the electron cloud, it has 23 orbitals in 8 shells, together with the number of electrons would result in the electron notation of 136-8-23.

Cavendishium atom masses 376 amu, with 99.98% of the mass make up the nucleus which makes up only a tiny portion of its atomic size. Its atomic radius is 152 pm while its nuclear radius is 0.00860 pm, that's a quotient of 18000. Which means that the whole atom takes up 5.5 trillion times more space than its nucleus!

Isotopes Edit

Like every other element heavier than lead, cavendishium has no stable isotopes. The longest-lived isotope is 373Cv with a half-life of 4.5 days, alpha decaying to 369Ah. All other isotopes have half-lives less than 4.1 hours (372Cv) and majority of these have half-lives less than 2.8 minutes. The most stable meta state is 370m2Cv with a half-life of 2 minutes 21 seconds, while 370m1Cv lasts a bit shorter at 1 minute 37 seconds.

Chemical properties and compounds Edit

Cavendishium is quite electropositive meaning it readily reacts with electronegative elements such as oxygen (for example by air), fluorine, and chlorine. Due to its basic nature of cavendishium, it neutralizes acids by displacing hydrogen atoms. The metal also displaces hydrogen atoms in water to form a basic solution of cavendishium hydroxide. When dissolved in water, green Cv6+ ions is more common than blue Cv4+.

Cavendishium hexafluoride (CvF6) is a yellow crystalline solid while cavendishium tetrafluoride (CvF4) is also a yellow crystalline solid. They both hydrolyse in water respectively to CvOF4 and CvOF2 (both white solids) by liberating hydrogen gas. When exposed to air, it quickly forms cavendishium dioxide (CvO2), which is black amorphous oxide. Further oxidation produces cavendishium trioxide (CvO3), a purplish black amorphous solid. Another halide in addition to fluoride is chloride: CvCl4 and CvCl6, both white ionic solids. Another cavendishium chalcide in addition to oxide are CvS2 and CvS3. There are also heavier chalcides, CvSe2, CvTe2, and CvPo2.

Cavendishium(IV) sulfate (Cv(SO4)2) and cavendishium(VI) nitrate (Cv(NO3)6) are examples of salts, form when cavendishium displaces hydrogen atoms in sulfuric acid and nitric acid, respectively.

Physical properties Edit

Cavendishium is a dark turquoish gray metal whose density is 5.89 g/cm3 and molar volume 63.8 cm3/mol. The crystals form hexagonals and the average atomic separation is 473 pm. In one cubic centimeter of metal, there are nearly 9½ sextillion cavendishium atoms, which is actually quite few compared to other metals. The number of atoms is computed from average atomic separation and bulk density.

Cavendishium's melting point is 802 K (529°C). If we multiply its melting point in Kelvin by its liquid ratio of 2.37, we get the boiling point, which is 1898 K (1625°C). Its heat of fusion (7.75 kJ/mol) and heat of vaporization (171.6 kJ/mol) are related to melting and boiling points in Kelvin, respectively. The molar heat capacity is 21.23 J/(mol•K).

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 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 cavendishium in the universe by mass is 7.83 × 10−29, which amounts to 2.62 × 1024 kilograms or more than 50% the mass of Venus worth of cavendishium.

Synthesis Edit

To synthesize most stable isotopes of cavendishium, 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, 373Cv.

Bi + 127
I + 37 1
n → 373
Bh + 64
Cu + 30 1
n → 373
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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