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Biunoctium
218Buo


Buo

biunseptiumbiunoctiumbiunennium
Appearance
unknown
General properties
Name, symbol, number biunoctium, Buo, 218
Element category unknown
Group, period, block uncertain
Mass number not appplicable
History
Discovery undiscovered
First isolation undiscovered
Physical properties
unknown
Atomic properties
unknown
Most stable isotopes
Main article: Isotopes of biunoctium
iso NA half-life DM DE (MeV) DP
742Buo
(predicted)
syn ?
vter

Biunoctium, Buo, is the systematic temporary name of the theoretical element with 218 protons. It is unlikely that this element exists,

History[]

Buo has the highest atomic number of any element whose atomic properties have been studied professionally (although this work is now obsolete). At one time, it was thought that Buo ended the ninth period, something now thought unlikely.

Nuclear Properties[]

No predictions for half-life or decay modes are available for elements with Z > 175. It is possible to determine a boundary in the (Z,A) {or (Z,N)} plane outside of which no nuclides are possible, as detailed in The Final Element.

A nuclear drop containing 218 protons and more than 758 neutrons must decay by neutron emission with a half-life under 10-14 sec. A drop with 218 protons and fewer than 445 neutrons must decay by spontaneous fission with a half-life under 10-14 sec. Nuclear drops in the band from 976Buo to Buo663 are not required to decay either by neutron emission or by fission, so it is possible they will survive the 10-14 sec needed for them to become nuclides.

The boundary described above was arrived at by applying large factors of safety to quantities which have been predicted. By looking at which factors apply to a particular (Z,A) point, it is possible to make a qualitative guess how likely it is that (Z,A) is a nuclide. Details of this method are given in Nuclear Guesswork. What follows should not be considered predictions, only guesses as to what might be. Likelihood that a nuclide can exist are given in four categories: likely, unlikely, improbable, and not impossible.

Nuclear drops in the bands 976Buo to 967Buo and 867Buo to 846Buo are likely to decay by neutron emission but are stable against fission. Nuclides in these bands are unlikely. Drops in the bands 966Buo to 868Buo and 845Buo to 808Buo are likely to decay by neutron emission and require a moderate amount of structural correction energy. Nuclides in these bands are improbable. Drops in the band 807Buo to 728Buo are unlikely to decay by neutron emission but require moderate structural correction. Nuclides in this band are unlikely. Drops in the band 727Buo to 663Buo are unlikely to decay by neutron emission but require large structural correction. Nuclides in this band are improbable.

Formation[]

Beyond Z = 175, the neutron dripline can only be constrained within a minimum value, Nc(Z) at which neutron decay becomes unlikely and a maximum value, Np(Z), at which it becomes inevitable. Drops 976Buo to 807Buo lie within this band. Since a disintegrating neutron star can supply pieces of nuclear matter of the right size (see Neutron Star), any isotope in that band is possible if the actual neutron dripline lies at the right location. No single dripline location will cause all isotopes to form, though.

Since 218 < 1.25*175, chances are that the actual dripline lies close to Nc(218).

Drops 806Buo to 663Buo require at least one beta decay from a mother nucleus which is itself unlikely at best. It is unlikely for isotopes in this band to form.

Chemical properties[]

The nuclear charge of Buo is so great that stationary-state orbital theory cannot describe its electrons. In addition, both nuclear size and nuclear shape may affect its electron structure. If these effects are small, and if the assumptions made in Period 9 Elements are valid, Buo will be a 9th period d-block metal.

References[]

References are given in the articles cited.

Interesting, but not valid, references include:

Elements 175 and Beyond
175-226 175
Usp
176
Ush
177
Uss
178
Uso
179
Use
180
Uon
181
Uou
182
Uob
183
Uot
184
Uoq
185
Uop
186
Uoh
187
Uos
188
Uoo
189
Uoe
190
Uen
191
Ueu
192
Ueb
193
Uet
194
Ueq
195
Uep
196
Ueh
197
Ues
198
Ueo
199
Uee
200
Bnn
201
Bnu
202
Bnb
203
Bnt
204
Bnq
205
Bnp
206
Bnh
207
Bns
208
Bno
209
Bne
210
Bun
211
Buu
212
Bub
213
But
214
Buq
215
Bup
216
Buh
217
Bus
218
Buo
219
Bue
220
Bbn
221
Bbu
222
Bbb
223
Bbt
224
Bbq
225
Bbp
226
Bbh
227-278 227
Bbs
228
Bbo
229
Bbe
230
Btn
231
Btu
232
Btb
233
Btt
234
Btq
235
Bth
236
Bts
237
Bts
238
Bto
239
Bte
240
Bqn
241
Bqu
242
Bqb
243
Bqt
244
Bqq
245
Bqp
246
Bqh
247
Bqs
248
Bqo
249
Bqe
250
Bpn
251
Bpu
252
Bpb
253
Bpt
254
Bpq
255
Bpp
256
Bph
257
Bps
258
Bpo
259
Bpe
260
Bhn
261
Bhu
262
Bhb
263
Bht
264
Bhq
265
Bhp
266
Bhh
267
Bhs
268
Bho
269
Bhe
270
Bsn
271
Bsu
272
Bsb
273
Bst
274
Bsq
275
Bsp
276
Bsh
277
Bss
278
Bso
279-324 279
Bse
280
Bon
281
Bou
282
Bob
283
Bot
284
Boq
285
Bop
286
Boh
287
Bos
288
Boo
289
Boe
290
Ben
291
Beu
292
Beb
293
Bet
294
Beq
295
Bep
296
Beh
297
Bes
298
Beo
299
Bee
300
Tnn
301
Tnu
302
Tnb
303
Tnt
304
Tnq
305
Tnp
306
Tnh
307
Tns
308
Tno
309
Tne
310
Tun
311
Tuu
312
Tub
313
Tut
314
Tuq
315
Tup
316
Tuh
317
Tus
318
Tuo
319
Tue
320
Tbn
321
Tbu
322
Tbb
323
Tbt
324
Tbq
325+
Tbp+
Likelihood of an Element's Existence
Likely Unlikely Improbable Not Impossible Um.

(05-14-20)

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