How many elements have been found now?

Now artificially crafted to Element 118 (except for Element 117 vacant).

Scientists observed the atomic "decay chain" process of superheavy element No. 118, confirming the existence of this new superheavy element. The 118-proton element is the heaviest known element and the first man-made noble gas. This superheavy element exists for an extremely short period of time, about milliseconds, or nine ten-thousandths of a second, after which it rapidly decays into other elements with smaller atomic weights

It first decays from element 118 to element 116, then continues to decay into element 114, then decays again to element 112, and finally splits into two.

The test was conducted jointly by scientists from the Lawrence Livermore National Laboratory in the United States and the Joint Institute for Nuclear Research in Dubna, Russia, and its research report was published in the American journal Physical Review in October this year. Previously, the joint U.S.-Russian team had successfully synthesized four new elements, 113, 114, 115 and 116. At the moment, this new element has not been officially named.

Ken Modi, a scientist at Livermore National Laboratory, said the new element would only be officially named if it was recognized by the Society of International Scientists, and that elements 113, 114, 115 and 116 that preceded it had not yet been officially named.

The joint research team of the Lawrence-Livermore National Laboratory in Livermore, California, USA, and the Joint Institute for Nuclear Research in Dubna, Russia, announced on the 16th that they have successfully produced element No. 118 in Mendeleev's periodic table.

Ken Moody, the leader of the research team, announced at a press conference on the 16th that they used a cyclotron to accelerate many calcium-48 ions twice in Dubna, which were used to bombard the artificial element californium-249, thus creating three new atoms.

The nucleus of each new atom contains 118 protons and 179 neutrons. That is, this new element has an ordinal number of 118 and an atomic weight of 297 in the periodic table.

According to the periodic table ordering law, element 118 is ranked below radon and is classified as an inert element. In Mendeleev's periodic table, there are only 92 species in nature, and scientists have managed to create another 18 elements that have been recognized and named. In addition, there are elements that have not been recognized or named, and element 118 is not among the named elements.

Scientists say they created an atom of Element 118 that exists for only milliseconds.

119 species...

According to Interfax, Russian scientists recently announced that they have found element No. 119 on the periodic table.

On September 26, the All-Russian Institute of Inventors' Patents in Yekaterinburg, Russia, welcomed a special guest, an engineer from the Sverdrov region, who claimed to have discovered element No. 119 on the periodic table and wanted to obtain the patent.

The engineer, who did not want to give his name or reveal how the element was synthesized, explained to the institute's experts that in terms of weight, element 119 is 299 times that of hydrogen, that is, its atomic weight is 299; It is a new element that has not yet been recorded on the periodic table and finally completes the periodic table.

If the claim that element 119 weighs 299 times that of hydrogen is true, then the claim that it completes the periodic table is not false, but it is puzzling. This is because this element, if present, will open the eighth column of the periodic table, which is located in the first position in the lower left corner, which is contrary to the statement of completing the periodic table.

As we all know, the last element on the periodic table is element No. 118, which is a noble gas element, which was successfully synthesized by American and Russian scientists using the Russian cyclotron No. 118 superheavy element, and in 2006 this result was recognized, the atomic weight of this No. 118 element is 294, only one ten-thousandth of a second, after that, the decay of element No. 118 produced element No. 116, and then continued to decay into element No. 114.

In total, 118 elements were discovered.

Radioactive elements: 23 species.

I'm a sophomore in high school, and I just got a chemistry book to help you order).

If you don't think I'm detailed. Yes.

A total of 117 elements have been found (synthesized to element 118, but element 117 is missing).

Many elements can have two or three atoms corresponding to each other, so there are many types of atoms found in total.

Among them, the elements of No. 95 and after No. 95 are radioactive, a total of 23 species.

There are 118 elements found in bai, 94 of which are found on the earth.

Chemical elements refer to more than 100 kinds of basic metallic and non-metallic substances in nature, which are composed of only one kind of atom, and their nuclei have the same number of protons, which cannot be decomposed by ordinary chemical methods, and can constitute all substances. Some examples of common elements are hydrogen, nitrogen, and carbon.

<> up to now, humans have discovered a total of 118 elements.

Lavoisier. In his book "Treatise on the Fundamentals of Chemistry", published in 1789, he listed the list of chemical elements he produced.

A total of 33 chemical elements are listed, divided into 4 categories:

1. Simple substances in a gaseous state, which can be regarded as elements: light, heat, oxygen, nitrogen, hydrogen;

2. Simple non-metallic substances that can be oxidized and formed into acids: sulfur, phosphorus, carbon, hydrochloric acid, hydrofluoric acid.

base, boric acid group;

3. Simple metal substances that can be oxidized and formed into salts: antimony, arsenic, silver, cobalt, copper, tin. Iron, manganese, mercury, molybdenum, gold, platinum, lead, tungsten, zinc;

4. Simple soil that can be turned into salt: lime, bitter soil, heavy soil, bauxite, silica.

There are 118 elements found, 94 of which are found on Earth.

Chemical elements refer to more than 100 basic metallic and non-metallic substances in nature, which are composed of only one kind of atom, and their nuclei have the same number of protons, which cannot be decomposed by ordinary chemical methods, and can constitute all substances. Some examples of common elements are hydrogen, nitrogen, and carbon.

To date, chemists have discovered 118 elements. But element number 118 is not the end of the periodic table.

A total of 118 elements have been discovered so far, of which 94 are found in the earth's nature.

Contains man-made elements, a total of 118 elements have been found so far.

Hello, how many elements are there in the world? There is no accurate data on this at the moment, because there are many man-made elements, some of which may only exist for a few tenths of a second.

26 chemical elements: H (hydrogen), HE (helium), LI (lithium), BE (beryllium), B (boron). C (carbon), N (nitrogen), O (oxygen), F (fluorine), Ne (neon).

Na (sodium), mg (magnesium), Al (aluminum), Si (silicon), P (phosphorus). S (sulfur), Cl (chlorine), AR (argon), K (potassium), Ca (calcium).

The way in which chemical elements are sortedThere is an obvious regularity in the electron arrangement and properties outside the nucleus of atoms, and scientists arrange them in increasing atomic numbers, placing elements with the same number of electrons in the same row and elements with the same number of electrons in the outermost shell in the same column.

Each horizontal row in the periodic table is called a period, and each vertical row is called a family (vertical row is a family). These 8 cycles can be divided into short cycles, long cycles) and incomplete cycles (8). There are 16 families, which are divided into 7 main families ( a a a), 7 sub families ( b b), families (including three vertical rows), and one zero family.

As of September 30, 2022, there were 118.

First cycle: 2, 2nd cycle: 8, 3rd cycle:

8, 4th cycle: 18, 5th cycle: 18, 6th cycle:

32, 7th Cycle Chang Mark: 32. There are 118 elements in the periodic table of the yuanzhongqin.

The periodic table is resistant to cultivation and has 7 periods and 16 groups. Each horizontal row is called a cycle, and each vertical row is called a family (group VIII contains three columns). These 7 cycles can be divided into short cycles and long cycles).

There are 16 families, one in each column from left to right (except for VIII). For example: hydrogen belongs to group IA elements, while helium belongs to group 0 elements.

Element position inference.

1. The number of elemental periods is equal to the number of electron layers outside the nucleus.

2. The ordinal number of the main group elements is equal to the number of outermost electrons.

3. To determine the number of families, we should first determine whether it is the main family or the secondary family, and the method is to use the atomic number to gradually subtract the number of elements in each period, which can be determined by the final difference. In the first to fifth periods, when the difference is less than or equal to 10, the difference is the family ordinal, when the difference is , it is the family, and when the difference is greater than 10, then subtract 10, and the final result is the family ordinal.

In the section. The difference between the six and seven cycles is 1: group a, and the difference is 2:

A group, the difference is 3 17: lanthanide or actinides, the difference is between 18 and 21: minus 14, the difference is 22 24:

Family, the difference is greater than 25: minus 24, which is the corresponding main family.

1 hydrogen (qīng) 2 helium (hài) 3 lithium (lǐ) 4 beryllium (pí) 5 boron (péng) ;

6 carbon (tàn) 7 nitrogen (dàn) 8 oxygen (yǎng) 9 fluorine (fú) 10 neon (nǎi);

11 sodium (nà) 12 magnesium (měi) 13 aluminum (lǚ) 14 silicon (guī) 15 phosphorus (lín);

16 sulfur (liú) 17 chlorine (lǜ) 18 argon (yà) 19 potassium (jiǎ) 20 calcium (gài).

Cognitive history

Historical origins. The origin of the idea of elements is very early, the ancient Babylonians and ancient Egyptians once regarded water (and later air and earth) as the main elements of the world, forming the three-element theory. The ancient Indians had four major doctrines, and the ancient Chinese had the Five Elements Doctrine.

The doctrine of the elements, that is, the doctrine of the elements as the simplest constituent parts of all real objects in nature, has arisen since time immemorial. However, in ancient times, the modern notion of elements as a concrete form of matter did not exist.

Whether in the ancient philosophy of our country, or in the ancient philosophy of India or the West, the element is regarded as an abstract, a manifestation of the primitive spirit, or the basic nature of matter.

Ancient Greek natural philosophy put forward the famous theory of the four elements. This was not created by Greek philosophers, and the theory of the four elements existed in the traditional folk beliefs of ancient Greece, but was not (relatively speaking) supported by a solid theoretical system. The philosophers of ancient Greece "borrowed" the concepts of these elements as essence.

The above content reference: Encyclopedia - Chemical Elements.

A total of 118 types: Arrange elements by cycle time:

First cycle: hydrogen, helium.

Second cycle: lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon.

Third cycle: sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon.

Fourth cycle: potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, germanium, arsenic, selenium, bromine, krypton.

Fifth cycle: rubidium, strontium, yttrium, zirconium, niobium, molybdenum, technetium, ruthenium, rhodium, palladium, silver, cadmium, indium, tin, antimony, tellurium, iodine, xenon.

Sixth cycle: cesium, barium, lanthanum, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, stone, lead, bismuth, polonium, astatine, radon.

Seventh cycle: francium, radium, actinium.

There are currently 118 elements in the periodic table, of which only 94 are currently found in nature, and the other 24 are synthesized artificially.

The 118 elements are not a collection of all the elements in the universe, although there are only 94 kinds of natural elements that we have discovered so far, but the universe is vast and vast, and we know that we don't even count 1%, and in the unknown universe, there may be other more mysterious and complex natural elements.