Russian scientists announced that they had found the element 1 19 in the periodic table. The All-Russian Inventor Patent Research Institute in Yekaterinburg, Russia, welcomed a special guest. He is an engineer from Sverdrov. He claimed that he had discovered the element 1 19 on the periodic table, hoping to obtain this patent. The engineer did not want to be named, nor did he disclose the synthesis method of this element to the outside world. He explained to the experts in the institute that the element 1 19 is 299 times that of hydrogen, that is, its atomic weight is 299; It is a new element that is not recorded in the periodic table, and finally completes the periodic table. If it is correct to say that the weight of element 1 19 is 299 times that of hydrogen, then it is not wrong to say that it completes the periodic table of elements, but it is puzzling. Because if this element exists, it will open the eighth row of the periodic table, which is located in the first position in the lower left corner, which is contrary to the statement that the periodic table is complete. As we all know, the last element in the periodic table is 1 18, which is an inert gas element. American and Russian scientists successfully synthesized the superheavy element 1 18 by using the Russian cyclotron. In 2006, this result was recognized, and the atomic weight of this element 1 18 was 297. The decay of element 1 18 produced element 1 16, and then it continued to decay into element 1 14.
But now the last number in the periodic table is 1 18.
118: Uuo Unoctium (1-1-8-ium) (element symbol uuo) is a synthetic chemical element with an atomic weight of 293 and a half-life of 12 milliseconds (one thousandth of a second). It is a gas element, and its chemical properties are very inactive. Belongs to the category of rare gases. Nuclear reaction preparation equation: kr+Pb->; Uuo+n
[Edit this paragraph] Physical properties of uncontaminated substances:
Gas, which can be liquefied under pressure; Melting point: ≥-30℃; Boiling point: ≥-20℃; Color: colorless (same as other six rare gases (helium, neon, argon, krypton, xenon, radon)). 1999, V. Ninov of Berkeley Laboratory published the experimental result of generating element 1 18 through 1n channel with 86Kr+208Pb [Nin99], but this result was withdrawn in 200 1 year. June 25th, 2002. Ts。 Oganessian of Dubna reported the new results of Dubna's synthesis of 1 18 element in the academic report made by GSI of German Heavy Ion Research Center. The energy of the incident beam 48Ca is 5. 1 MeV/u, the excitation energy of the composite nucleus is 29 MeV, the beam intensity is 0.8 pmA, the target is 230 mg/cm2, the purity is 97.3%, the total weight is 7. 1 mg, and the emission is 2? 109 A particle). The total beam time is 75 days, and the corresponding total exposure is 2? 10 19 beam particles. Before the experiment, it is estimated that the cross section of 3n channel is ~0.5 pb, and the cross section of 4n is
Someone forged it seven years ago.
This newspaper comprehensively reported that 1999, a scientific group has announced the creation of the element 1 18. However, in 2002, the scientific team was forced to withdraw the statement because it was found to have falsified data and a scientist was fired. Three of them later joined the United States-Russia joint team. Modi said that in order to prevent fraud, scientists took preventive measures this time to minimize the possibility that a scientist could master all the key data alone. Nancy Stojil, a member of the research team and an American scientist, said, "I want to say that we are very sure." He estimated that the probability that the result was wrong was less than one in ten thousand. Richard Carsten, deputy editor-in-chief of Physical Review and professor of physics at Yale University, also said that due to the high sensitivity of this issue, this research report has been strictly reviewed. Carsten said that this discovery still needs to be confirmed by other scientists. In this regard, Modi said that it may take several years.
Plan to synthesize heavier elements
It is reported that the United States-Russia joint team will also try to synthesize elements with larger atomic weights and make them exist for a longer time, such as minutes, months or even longer. It is reported that the team plans to bombard plutonium with iron isotopes in 2007 to produce 120 element. There are 92 elements ranging from hydrogen to uranium in nature. According to their atomic numbers, their ranking on the periodic table is from 1 to 92. Most of the overweight elements in nature did not exist originally, but were synthesized by scientists by hitting lighter atoms. Scientists want to know what is the heaviest element in artificial synthesis, which should be limited in theory. Konrad Golbuk, an American scientist, said that creating a new element is like finding the "laurel in the field of nuclear physics" because the process is extremely difficult. Everything seems normal, and Lawrence Berkeley's research team has even turned its attention to the next element: 1 19. The remaining work is to make other scientists in the world repeat their experiments and produce more elements 1 18. Scientists involved in this work are from darmstadt Institute of Heavy Particles (GSI), French National Heavy Particle Accelerator (GANIL) and Japanese Institute of Physical Chemistry (RIKEN). However, this matter is not as simple as people think. German, French and Japanese research groups can't produce element 1 18 in any case-the probability of producing new elements is too small, and any uncertain factors may make the experiment completely fail. Lawrence Berkeley's research team went back to repeat the experiment, and as a result, they couldn't make this element themselves. The element 1 18 mysteriously disappeared on the periodic table. Nothing is more puzzling than this bizarre theft. Lawrence Berkeley's team then reanalyzed the original experimental data of 1999. The analysis results show that the conclusion of "element 1 18" is not valid, and the experimental data can not explain that they have observed the theoretical prediction of α decay. Therefore, in August this year, Lawrence Berkeley's research team once again submitted a report to Physical Review Express, announcing the withdrawal of their statement on the study. The members of the research team said that they still don't know what caused this incident, and there have been several explanations about this incident, but they are not very reliable. Therefore, it is not yet possible to say why the element 1 18 was obtained and lost. However, this mysterious "theft case" illustrates a truth: science does not always make mistakes, but science has a self-correcting mechanism, which ensures the greatest correctness of science. Scientific experiments that draw facts should be repeatable. If it is not repeatable, science cannot accept it. Repeatability is the most fundamental criterion of science. Another example is the magnetic monopole: some people claim that the trace of the magnetic monopole was found in an observation. But this evidence alone cannot prove the existence of magnetic monopoles, whether it is caused by experimental errors or true. Only in this way can we ensure that the facts we get are objective. It seems that the element 1 18 will be missing for a while. It may really exist, or it may just be an illusion on the calculus paper. Who stole the element 1 18? Scientists have a headache with fear.
[Edit this paragraph] The significance of discovering the element 1 18.
The familiar periodic table of elements, at the end of the horizontal period, are all inert gas elements. The newly discovered inert gas element 1 18 is located at the end of the seventh cycle. Like the 32 elements in the sixth period, there are 18 squares in the horizontal direction, plus 65438+ hidden behind the actinides. In this way, the number of vertical elements in each period of the element table, even-odd symmetrical square sequence prototype has basically formed: odd period 1: hydrogen helium (1* 1= 1 pair) 3: sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon (2 * 2 3=9 pairs) 7th cycle: ⅶⅶⅶⅶⅶⅶⅶⅶⅶⅶ85555 4 = 16 pairs) 4th cycle: K. 9 pairs, 4 pairs, (to complete symmetry, we need to find 1 pair element in the eighth issue) The great significance of discovering the element 1 18 lies in that symmetry and square are two mathematical tools for human beings to explore natural laws.