Unbinilium

properties
Properties (if known)
Name , symbol , atomic number	Unbinilium, Ubn, 120
Element category	Unknown
Group , period , block	2 , 8 , p
CAS number	54143-58-7
Atomic
Atomic mass	estimated 297 u
Electron configuration	[ Og ] 8 s 2 (?)
Electrons per energy level	2, 8, 18, 32, 32, 18, 8, 2
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Values that are particularly questionable are marked with (?)

Unbinilium is a currently hypothetical chemical element with the atomic number 120, it is also known as Eka - Radium .

In the periodic table it is between the ₁₁₉Ununennium and the ₁₂₁Unbiunium .

In the extended periodic table (it is outside the "normal" periodic table ) it belongs to the alkaline earth metals and to the transactinoids . The name is the temporary systematic IUPAC name and stands for the three digits of the ordinal number. In the periodic table of the elements, it is expected to be an s-block element, an alkaline earth metal and the second element of the eighth period.

Unbinilium is a radioactive element that does not occur naturally and therefore has to be produced by a nuclear reaction . It should be part of the so-called " island of stability ", i. H. In contrast to most other transactinoids, they do not disintegrate within fractions of a second, but last much longer. The isotope ³⁰⁴ Ubn would probably be the most stable due to its ideal 184 neutrons (see magic numbers ).

Attempts by the GSI Helmholtz Center for Heavy Ion Research in Darmstadt-Arheilgen to detect the element have so far failed. At the same time, the United Institute for Nuclear Research in Dubna near Moscow is also trying to prove the element.

Target-projectile combinations for cores with Z = 120

The following table shows all the combinations for targets and projectiles that could be used to generate nuclei with a charge number of 120 whose half-life does not stand in the way (T _1/2 > 0.2 a).

Although the prediction of the exact location of the island of stability fluctuates, it is assumed to be in the region of the isotope ³⁰⁰ Ubn.

Target		projectile		product
core	HWZ (a)	core	HWZ (a)	core	core	comment
²⁰⁸Pb	stable	⁸⁸Sr	stable	²⁹⁶ Ubn	²⁹³ Ubn	°) too low in neutrons
²⁰⁸Pb	stable	⁹⁰Sr	29	²⁹⁸ Ubn	²⁹⁵ Ubn	°) too low in neutrons
²³²Th	14 billion	⁷⁰notes	stable	³⁰² Ubn	²⁹⁹ Ubn
²³⁸U	4.5 billion	⁶⁴Ni	stable	³⁰² Ubn	²⁹⁹ Ubn
²³⁷Np	2.1 million	⁵⁹Co	stable	²⁹⁶ Ubn	²⁹³ Ubn	°) too low in neutrons
²³⁷Np	2.1 million	⁶⁰Co	5.3	²⁹⁷ Ubn	²⁹⁴ Ubn	°) too low in neutrons
²⁴⁴Pu	80 million	⁵⁸feet	stable	³⁰² Ubn	²⁹⁹ Ubn
²⁴⁴Pu	80 million	⁶⁰feet	2.6 million	³⁰⁴ Ubn	³⁰¹ Ubn
²⁴³On	7370	⁵⁵mn	stable	²⁹⁸ Ubn	²⁹⁵ Ubn	°) too low in neutrons
²⁴⁸cm	340000	⁵⁴Cr	stable	³⁰² Ubn	²⁹⁹ Ubn
²⁵⁰cm	8300	⁵⁴Cr	stable	³⁰⁴ Ubn	³⁰¹ Ubn
²⁴⁷Bk	1380	⁵¹V	stable	²⁹⁸ Ubn	²⁹⁵ Ubn	°) too low in neutrons
²⁴⁸Bk	9	⁵¹V	stable	²⁹⁹ Ubn	²⁹⁶ Ubn
²⁴⁹Bk	0.88	⁵¹V	stable	³⁰⁰ Ubn	²⁹⁷ Ubn
²⁴⁹Cf	351	⁵⁰Ti	stable	²⁹⁹ Ubn	²⁹⁶ Ubn
²⁵⁰cf	13	⁵⁰Ti	stable	³⁰⁰ Ubn	²⁹⁷ Ubn
²⁵¹Cf	900	⁵⁰Ti	stable	³⁰¹ Ubn	²⁹⁸ Ubn
²⁵²Cf	2.6	⁵⁰Ti	stable	³⁰² Ubn	²⁹⁹ Ubn
²⁵²it	1.3	⁴⁵Sc	stable	²⁹⁷ Ubn	²⁹⁴ Ubn	°) too low in neutrons
²⁵⁴it	0.75	⁴⁵Sc	stable	²⁹⁹ Ubn	²⁹⁶ Ubn
²⁵⁷m	0.28	⁴⁸approx	~ stable	³⁰⁵ Ubn	³⁰² Ubn

°) If one follows the trend of the last produced isotopes of ₁₁₆ Livermorium and ₁₁₈ Oganesson, these nuclei contain far too few neutrons to have longer half-lives.

Target-projectile combinations for cores with Z = 120, A = 304

The doubly magical ³⁰⁴ Ubn probably cannot be synthesized on earth by means of reactions of two nuclei. For the synthesis, nuclei with very short half-lives would have to be used (which cannot be produced in sufficient quantities with today's technology), the reaction really has to take place and only comparatively few neutrons can be evaporated to de-energize the nucleus. The isotope could arise in supernovae with their high particle densities.

Target		projectile		product
core	HWZ (d)	core	HWZ (a)	core	core	comment
²⁴⁶Pu	11	⁶⁰feet	2.6 million	³⁰⁶ Ubn	→ ³⁰⁴ Ubn + 2 n
²⁴⁷Pu	2.3	⁶⁰feet	2.6 million	³⁰⁷ Ubn	→ ³⁰⁴ Ubn + 3 n	most likely reaction, since at least 3 neutrons may be evaporated
²⁵²cm	2	⁵⁴Cr	stable	³⁰⁶ Ubn	→ ³⁰⁴ Ubn + 2 n

Web links

Wiktionary: Unbinilium - explanations of meanings, word origins, synonyms, translations

Individual evidence

↑ Mark Winter: Approaches to element 120 (unbinilium). The University of Sheffield and WebElements Nexus, accessed March 6, 2012 (1993–2011).
^ Superheavy, and yet stable. Max Planck Society , August 23, 2012, accessed on April 20, 2018 (English): "We expect [the island of stability] at around element 120," says Blaum, "and to be more precise, in a nucleus with around 180 neutrons. "

[1] Mark Winter: Approaches to element 120 (unbinilium). The University of Sheffield and WebElements Nexus, accessed March 6, 2012 (1993–2011).

[2] Superheavy, and yet stable. Max Planck Society , August 23, 2012, accessed on April 20, 2018 (English): "We expect [the island of stability] at around element 120," says Blaum, "and to be more precise, in a nucleus with around 180 neutrons. "