Janskyum is the provisional non-systematic name of an undiscovered element with the symbol Jk and atomic number 190. Janskyum was named after Karl Guthe Jansky (1905–1950), who discovered radio waves emanating from the Milky Way. This hypothetical element with atomic number 190 is known in the scientific literature as unennilium (Uen) or simply element 190. It is located in the periodic table coordinate 6g16.
Atomic properties[]
Since its atomic number is greater than 173 (messierium), the properties below are only predicted. Its nucleus contains 190 protons and 407 neutrons, corresponding to its nuclear ratio (neutrons per proton) of 2.14. It has an atomic mass of 596.76 amu. There are six electrons in the 7f orbital, four electrons in the 8d orbital and eight electrons in the 6g orbital for this element.
Isotopes[]
Like every other element heavier than lead, janskyum has no stable isotopes. The longest-lived isotope is 597Jk, with a half life of 23.782 milliseconds (2.3782 × 10−2 s). Unlike all elements in late period 8 and most other elements in period 9 which decay by spontaneous fission, 597Jk decays into 593Cy by alpha decay. 564Jk is predicted to have a half life similar to 597Jk.
It is also expected to have several isomers, which are excited states of normal ground state isotopes. It is possible that some of them have half-lives longer than the the longest-lived ground state isotope.
Chemical properties and compounds[]
Just as the lanthanides all have similar chemical properties while neptunium and plutonium share similarities with uranium, janskyum is expected to be like eddingtonium to lagrangum in terms of chemical compounds. Therefore, janskyum is expected to form a +6 (hexavalent) oxidation state. In addition, it may exhibit lower oxidation states starting from +1, losing electrons in the 7f and 8d orbitals. Some possible compounds include janskyum fluoride (JkF6), janskyum nitrate (Jk(NO3)4) and organojanskyum compounds.
Physical properties[]
Unusually for an element beyond period 7, janskyum is a slate metal, due to certain exchange of energies between different orbitals. These electrons excite energies at all regions of the visible spectrum in similar intensity, with the blue region of the visible spectrum exciting slightly more energy. Its density and molar volume has not been calculated yet as its half-life is too short. Like most metals, janskyum is predicted to be paramagnetic. It is a solid at room temperature. Its melting point is 1248.56 °C and its boiling point is 4192.21 °C under standard atmospheric pressure. This corresponds to its liquid range of 2943.65 °C and its liquid ratio of 2.93.
Occurrence[]
It is possible that janskyum doesn't exist in the universe at all, at any time in the past or in the future. This is because certain relativistic calculations state that the electrons of the 1s orbital will reach or exceed the speed of light in this element. Under this hypothesis, this element is impossible to create or exist. However, such a limit remains unproven, and it is possible that heavier elements and quantum mechanics will be further studied in the future, refining the limit of the number of protons an electrically neutral atom can have. Other common limits predicted include 137, 210 or even unlimited.
Synthesis[]
It might be impossible to synthesize janskyum due to quantum restrictions on the speed of electrons. If synthesis is possible, then nuclei of a couple lighter elements must be fused together, and the 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. Even if synthesis succeeds, this resulting element would almost immediately undergo fission.
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