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Unocttrium, Uot, is the temporary name for element 183. Nuclides of this element are likely to be possible. Although improbable, some Uot may form. If it does form, it will be gone less than 1000 sec. after the event which led to its formation.

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", this wiki.

A nuclear drop containing 183 protons and more than 618 neutrons must decay by neutron emission with a half-life under 10-14 sec. A drop with 183 protons and fewer than 270 neutrons must decay by spontaneous fission with a half-life under 10-14 sec. Nuclear drops in the band from 801Uot to 453Uot 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", this Wiki. 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 801Uot to 764Uot and 712Uot to 687Uot are likely to decay by neutron emission but are stable against fission. Nuclides in these bands are unlikely. Drops in the bands 763Uot to 713Uot and 686Uot to 668Uot 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 592Uot to 578Uot are unlikely to decay by neutron emission and are stable against fission. Nuclides in this band are likely. Drops in the bands 667Uot to 593Uot and 577Uot to 516Uot are unlikely to decay by neutron emission and require a moderate amount of structural correction energy. Nuclides in these bands are unlikely. Drops in the band 515Uot to 453Uot are unlikely to decay by neutron emission but require large structural correction. Nuclides in this band are improbable.

OCCURRENCE

FORMATION

592Uot to 578Uot are likely to be nuclides. Depending on the neutron dripline's actual location, nuclei in this A range may form when material over 700 - 800 meters deep is ejected from a neutron star during a merger. (See "Neutron Star", this Wiki.). Uot is too far from the neutron dripline for any of its isotopes to form directly, and most beta-decay chains from nuclides with suitable A terminate in fission at lower Z. It is, theoretically, possible for its lighter isotopes to form via beta decay, but attrition due to fission and beta+neutron(s) decays make actual formation essentially impossible in most cases. For 579Uot to 578Uot, however, beta-decay chains from the neutron dripline to Uot are possible. Attrition can be expected to be heavy, but formation of these nuclides is merely improbable, rather than effectively impossible.

It is implausible that neutron capture can form any Uot isotope.

PERSISTENCE

If Uot forms at all, it will decay away to nothing within 1000 sec after the neutron star merger which led to its formation.

ATOMIC PROPERTIES

The nuclear charge of Uot 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" (this wiki) are valid, Uot will be a 9th period active metal.

REFERENCES

References are given in the articles cited.

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.

(05-28-20)

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