Symbol Bs
Atomic number 171
Pronunciation /'bun•sin•ēn/
Named after Robert Bunsen
Name in Saurian Ridjodado (Rj)
Systematic name Unseptunium (Usu)
Location on the periodic table
Group 17
Period 8
Family Fluorine family (Halogens)
Series Kirchoffide series
Coordinate 8p5
Element above Bunsenine Tennessine
Element left of Bunsenine Helmholtzium
Element right of Bunsenine Ramson
Atomic properties
Subatomic particles 669
Atomic mass 502.1715 u, 833.8753 yg
Atomic radius 136 pm, 1.36 Å
Covalent radius 121 pm, 1.21 Å
van der Waals radius 206 pm, 2.06 Å
Nuclear properties
Nucleons 498 (171 p+, 327 no)
Nuclear ratio 1.91
Nuclear radius 9.47 fm
Half-life 116.66 ns
Decay mode Spontaneous fission
Decay product Various
Electronic properties
Electron notation 171-9-26
Electron configuration [Og] 5g18 6f14 7d10 8s2 8p5 9s2 9p2
Electrons per shell 2, 8, 18, 32, 50, 32, 18, 7, 4
Oxidation states −1, +1, +3, +5, +7
(a weakly acidic oxide)
Electronegativity 2.41
First ionization energy 987.2 kJ/mol, 10.231 eV
Electron affinity 290.0 kJ/mol, 3.006 eV
Physical properties
Bulk properties
Molar mass 502.172 g/mol
Molar volume 31.331 cm3/mol
Density 16.028 g/cm3
Atomic number density 1.20 × 1021 g−1
1.92 × 1022 cm−3
Average atomic separation 373 pm, 3.73 Å
Speed of sound 4749 m/s
Magnetic ordering Diamagnetic
Crystal structure Base-centered orthorhombic
Color Dark gray
Phase Solid
Thermal properties
Melting point 579.36 K, 1042.86°R
306.21°C, 583.19°F
Boiling point 755.86 K, 1360.56°R
482.71°C, 900.89°F
Liquid range 176.50 K, 317.70°R
Liquid ratio 1.30
Triple point 579.35 K, 1042.82°R
306.20°C, 583.15°F
@ 6.1244 kPa, 45.937 torr
Critical point 1166.66 K, 2099.99°R
893.51°C, 1640.32°F
@ 26.3621 MPa, 260.175 atm
Heat of fusion 19.037 kJ/mol
Heat of vaporization 60.528 kJ/mol
Heat capacity 0.03775 J/(g•K), 0.06795 J/(g•°R)
18.957 J/(mol•K), 34.122 J/(mol•°R)
Abundance in the universe
By mass Relative: 1.42 × 10−36
Absolute: 4.76 × 1016 kg
By atom 7.43 × 10−38

Bunsenine is the provisional non-systematic name of a theoretical element with the symbol Bs and atomic number 171. Bunsenine was named in honor of Robert Bunsen (1811–1899), a pioneer in photochemistry who studied the emission spectra of heated substances. This element is known in the scientific literature as unseptunium (Usu), dvi-astatine, or simply element 171. Bunsenine is the heaviest halogen and is the fifth member of the kirchoffide series, placing this element at 8p5 coordinate on the periodic table.

Atomic properties Edit

Bunsenine's atom is comprised of 669 subatomic particles, including 498 nucleons that make up the nucleus whose ratio is 1.91. This corresponds that there are nearly twice as many neutrons as protons. Heavier elements tend to have more neutrons relative to protons because of the increasing nuclear charge due to positively charged protons.

Surrounding the nucleus, there are 171 electrons in nine shells, but electrons are adding into the eighth shell. One of the orbitals in the eighth shell, 8p, needs one more electron to complete the orbital even though the first electron was added roughly 50 elements ago at lavoisium. However, the 8p orbital was split into 8p1/2 and 8p3/2, the former split orbital was completed 44 elements ago at planckium, while the first electron was added to 8p3/2 just two elements ago at joulium.

Isotopes Edit

Like every other element heavier than lead, bunsenine has no stable isotopes. The longest-lived isotope is 498Bs with an extremely brief half-life (t½) of 116⅔ nanoseconds. It undergoes spontaneous fission, splitting into three lighter nuclei plus neutrons like the example.

Bs → 192
Os + 141
Pr + 84
Kr + 81 1

Bunsenine has many meta states that are considerably longer lived than any isotope. One example of 501m1Bs, which is the longest-lived meta state (t½ = 467 milliseconds). The isomer lasts 4000 times longer than the longest-lived ground state isotope 498Bs.

Chemical properties and compounds Edit

Since bunsenine is a halogen, its chemical properties is assumed to be similar to other members. However, relativistic effects would make bunsenine quite unreactive. Like other halogens, it exhibits odd-number oxidation states, from −1 to +7. +3 (trivalent) is the most common state used in compounds as well as the most common state found in aqueous solutions. Bunsenine has an electronegativity of 2.41, placing it in the middle of the interval between astatine (2.20) and iodine (2.66) in values. The first ionization energy value is also placed in the interval between these two elements, though lot closer to iodine. As a result, bunsenine is more reactive than astatine and tennessine but less reactive than iodine and lighter halogens.

Bs2O3 is a dark reddish brown crystals, while BsN is a pinkish purple powder. Bs2S3 is a light orange crystals, while BsP is a yellow powder. Bunsenine can bond with other halogen to form bunsenine halides, such as BsF3, BsCl3, BsBr3, and BsI3. But when bonded with astatine and tennessine, it forms halogen bunsenides: AtBs and TsBs, respectively, since bunsenine is more electronegative than astatine and tennessine. Bunsenine can also bond to hydrogen to form hydrogen bunsenide (HBs) and forms hydrobunsenic acid when dissolved in water.

Bunsenine can form organic compounds, called organobunsenine compounds, whose properties are similar to organic compounds of lighter halogens. For example, bunsenine can form alcohols like dibutylbunsenine oxide (BuC6H18O), as well as sugars like bunsenine carbohydrates.

Physical properties Edit

At ordinary conditions, bunsenine is a dark gray metallic halogen. It is a good conductor of heat but electrical conduction is like a semiconductor. Bunsenine is the densest halogen at 16 g/cm3, twice as dense as iron. The molar volume is 31.3 cm3/mol, similar to astatine, a halogen three rows (two elements) above bunsenine. In ordinary conditions, atoms arrange to form orthorhombic crystals with average atomic separation of 373 pm. It is diamagnetic, meaning it can create its own magnetic field in the presence of externally applied field.

Like other halogens, its liquid range is narrow, between 583°F and 901°F, a bit wider than liquid range of water but with liquid ratio slightly less than water. With increase in temperature, it first becomes a liquid and then a gas. It requires 19 kJ of energy to turn from solid to liquid and requires 60½ kJ of energy to turn from liquid to gas. It takes 68 mJ of energy to heat one gram of bunsenine by 1°F.

Occurrence Edit

It is almost certain that bunsenine doesn't exist on Earth at all, but it is believe to barely exist somewhere in the universe due to its brief lifetime. Every element heavier than iron can only naturally be produced by exploding stars, then bunsenine must be produced in stars, and then thrown out into space by exploding stars. But it is likely 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. In the universe, only advanced technological civilizations can produce this element, but barely because it requires so much energy to produce this element, thus it is so unstable. On the 172-element periodic table, bunsenine is the rarest element in the universe at an estimated abundance of 1.42 × 10−36 by mass, which amounts to 4.76 × 1016 kilograms.

Synthesis Edit

To synthesize most stable isotopes of bunsenine, 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. Even if synthesis succeeds, this resulting element would immediately undergo fission. Here's couple of example equations in the synthesis of the most stable isotope, 498Bs.

Tb + 141
Pr + 107
Ag + 91 1
n → 498
Lr + 166
Er + 67 1
n → 498
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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