|Name in Saurian|| Fujkihaim (Fj)|
|Systematic name|| Unhexpentium (Uhp)|
|Location on the periodic table|
|Above element||Newtonium (119Nw)|
|Previous element||Gibbium (164Gb)|
|Next element||Hubbium (166Hb)|
|Family|| Hydrogen family|
|Atomic mass||485.0292 u, 805.4099 yg|
|Atomic radius||196 pm, 1.96 Å|
|Van der Waals radius||271 pm, 2.71 Å|
|Nucleons||481 (165 p+, 316 n0)|
|Nuclear radius||9.36 fm|
|Electron configuration|| [Gb] 9s1|
2, 8, 18, 32, 50, 32, 18, 4, 1
|Oxidation states|| +1, +3|
(strongly basic oxide)
|First ionization energy||518.4 kJ/mol, 5.373 eV|
|Electron affinity||73.2 kJ/mol, 0.759 eV|
|Covalent radius||196 pm, 1.96 Å|
|Molar mass||485.029 g/mol|
|Molar volume||65.712 cm3/mol|
|Atomic number density||9.16 × 1021 cm−3|
|Average atomic separation||478 pm, 4.78 Å|
|Speed of sound||1151 m/s|
|Crystal structure||Body centered cubic|
|Melting point|| 366.16 K, 93.01°C|
|Boiling point|| 1032.58 K, 759.43°C|
|Liquid range||626.42 K/°C, 1127.55°F/°R|
|Triple point|| 366.16 K, 93.01°C|
@ 7.6853 mPa, 5.7645 × 10−5 torr
|Critical point|| 3248.42 K, 2975.27°C|
@ 69.2452 MPa, 683.399 atm
|Heat of fusion||5.393 kJ/mol|
|Heat of vaporization||83.929 kJ/mol|
|Heat capacity|| 0.06156 J/g/K, 0.11080 J/g/°R|
29.856 J/mol/K, 53.742 J/mol/°R
|Universe (by mass)|| Relative: 6.37 × 10−44|
Absolute: 2.13 × 109 kg
Pasturium is the fabricated name of a hypothetical element with the symbol Ps and atomic number 165. Pasturium was named in honor of Louis Pasteur (1822–1895), pioneer of microbiology who developed germ theory. This element is known in scientific literature as unhexpentium (Uhp), dvi-francium, or simply element 165. Pasturium is notable for being the first period 9 element as the heaviest alkali metal, correspondingly located in periodic table coordinate 9s1.
Pasturium is the densest alkali metal due to the very high atomic mass of the element. The element's density of 7.4 g/cm3 is lot denser than the lighter homologue newtonium, whose value is just 2.8 g/cm3. Like all other alkali metals, pasturium is silvery, but for this region of the periodic table in terms of atomic numbers, it is unusual as metals surrounding this element are colored due to extreme quantum effects. Also like lighter cogeners, pasturium is soft enough to be cut with a knife.
Pasturium's melting point is expected to be just low enough to be a liquid at room temperature based on periodic trend, but it is not the case. With the absence of completed 8p subshell due to relativistic effects, the attractive forces between atoms would be stronger and would thus have higher melting point. Its melting point of 93°C (199°F) is similar to the melting point of sodium (98°C, 208°F). Its boiling point is 759°C (1399°F), about the same as potassium (758°C, 1397°F).
Pasturium's nucleus is comprised of 165 protons and 316 neutrons, which corresponds that its nuclear ratio is 1.92. It also has 165 electrons in 9 energy levels and 25 orbitals. Due to extreme relativistic effects causing smearing of the orbitals, after just completed the d-orbital, the electron is filling in the s-orbital in the ninth and outermost shell as if skipping the p-orbital. However, there are two electrons in the p-orbital that was last added 38 elements ago. The electrons are full in the p1/2 split orbital and none in the p3/2 split orbital.
Like every other elements heavier than lead, pasturium has no stable isotopes. The most stable isotope is 481Ps with a brief half-life of 880 microseconds. It undergoes spontaneous fission, splitting into three lighter nuclei plus neutrons like in the following example.
Pasturium has several meta states, such as 480m1Ps, which is the longest-lived excited state at 98 milliseconds.
Pasturium is a reactive metal, like all other alkali metals, because it needs to lose the only electron in its outermost orbital. In response, its oxidation state is +1 (monovalent), but due to electrons in the 8p1/2 orbital participate in bonding due to small spacing between the 8p1/2 and 9s orbitals, +3 state (trivalent) is also common. Pasturium(I) would behave like potassium or silver; pasturium(III) would behave like thallium. Its electronegativity is 0.97 and the first ionization energy is 5.37 eV, similar in values to sodium, meaning pasturium is just as chemically active as sodium. Pasturium(I) forms solution more easily than pasturium(III). Pasturium hydroxide (PsOH) forms when the metal reacts with water, and neutral salts of pasturium would form when the metal reacts with acids, like pasturium nitrate (PsNO3) obtained when pasturium reacts with nitric acid.
Pasturium can form numerous compounds. Pasturium(I) hydroxide (PsOH) is a highly basic substance formed when pasturium reacts vigorously with water. Pasturium(I) nitrate (PsNO3) is an example of a salt when pasturium neutralizes nitric acid. Pasturium(I) oxide (Ps2O) is a red powder, formed when the metal exposes to the air for even a short time. Another oxide is pasturium(III) oxide (Ps2O3), which is a white powder. Pasturium(I) chloride (PsCl) is a pale orange ionic salt formed when metal is heated and electrified with table salt (sodium chloride). PsCl can be reacted with chlorine gas to give PsCl3, also a pale orange ionic salt like the former. Pasturium(I) iodide (PsI) is a pale pink rhombohedric crystals. This metal can slowly react with pure nitrogen to form pasturium(I) nitride (Ps3N), a green powder, or pasturium(III) nitride (PsN), a greenish white powder. It also reacts vigorously with phosphorus to form pasturium(III) phosphide, which is a lime green powder.
Occurrence and synthesis Edit
It is almost certain that pasturium doesn't exist on Earth at all, but it is believed to exist somewhere in the universe, at least in very tiny amounts. Since every element heavier than lithium were produced by stars, then pasturium 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 heavy element. Instead, this element virtually can only be made by advanced technological civilizations. An estimated abundance of pasturium in the universe by mass is 6.37 × 10−39, which amounts to 2.13 × 109 kilograms or ⅓ the mass of Great Pyramid of Giza worth of this element.
To go along with other such civilizations, humans on Earth may eventually have the capability to synthesize pasturium. To synthesize most stable isotopes of hubbium, 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 vast amounts 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 481Ps.
Due to similarity to sodium in properties, pasturium uses would be similar to sodium, like in vapor lamps which give off bluish white light, in contrast to yellow light for sodium, laser guides in telescopes, and alloys. However, pasturium's useful applications would be impossible due to its extreme instability.