It is said that the atom was synthesized by artificial nuclear reaction in 2004.

Look at this report:

Russian researchers plan to artificially synthesize element 1 18 in the periodic table.

2002-08- 16 09: 1 1:48

Xinhuanet Moscow, August 15 (Reporter Luan Hai) On August 4th, Oganesian, scientific research director of the Nuclear Reaction Laboratory of Dubna Institute of Nuclear Research in Russia, announced that Russian researchers are preparing to synthesize 1 18 elements on the periodic table.

According to the ITAR-TASS news agency, the synthesis experiment of new elements will be divided into two stages, each of which takes about 4 months. In the first stage, researchers will bombard the curium target with isotope ions of calcium to explore the necessary conditions for synthesizing the element 1 18. In the second stage, experts will bombard the californium target with isotope ions of calcium, so that the nuclei of calcium and californium will be fused together to form the nuclei of new elements. Since the nuclear charge numbers of calcium atom and osmium atom are 20 and 98 respectively, the nuclear charge number of the new element atom should be 1 18, and its serial number on the periodic table will also be 1 18. In order to confirm the existence of element 1 18, experts need to record the nuclear synthesis and decay of new elements at least two or three times. At the same time, the researchers will also test the characteristics, lifetime, decay form and decay energy of the new element nucleus.

Oganesian revealed that the plan element 1 18 cannot be applied directly for the time being. However, scientists can explore the limits of the periodic table of elements through the above experiments. After the synthesis of the element 1 18, the international union of theoretical and applied chemistry will name this new element.

In June and July, 2000, experts from Dubna Nuclear Research Institute synthesized 1 14 and 1 16 respectively in the laboratory. Up to now, the overweight elements in the periodic table after 105 are rare in nature. A series of overweight elements discovered by scientists are all synthesized in the laboratory, and they will decay into elements with smaller atomic weight in a very short time after generation.

It seems to have been synthesized successfully in 2004.