1. Antiquity to the 18th century
     Hennig Brand    Antoine-Laurent de Lavoisier  

2. 19th century
     William Prout    Johann Wolfgang Döbereiner    Alexandre-Emile Béguyer de Chancourtois    John Newlands    Julius Lothar Meyer    {{Anchor|1=Dmitri Ivanovich Mendeleev}} Dmitri Mendeleev    William Odling   Shortcomings of early versions of the periodic table 

3. 20th century
     Frederick Soddy    Henry Moseley    Glenn T. Seaborg  

4. Main discovery periods

5. See also

6. References

7. External links

The periodic table is an arrangement of the chemical elements, which are organized on the basis of their atomic numbers, electron configurations and recurring chemical properties. Elements are presented in order of increasing atomic number. The standard form of the table consists of a grid with rows called periods and columns called groups.

The history of the periodic table reflects over two centuries of growth in the understanding of chemical properties, with major contributions made by Antoine-Laurent de Lavoisier, Johann Wolfgang Döbereiner, John Newlands, Julius Lothar Meyer, Dmitri Mendeleev, and Glenn T. Seaborg.^[1]

Antiquity to the 18th century

A number of physical elements (such as platinum, mercury, tin and zinc) have been known from antiquity, as they are found in their native form and are relatively simple to mine with primitive tools.^[2] Around 330 BCE, the Greek philosopher Aristotle proposed that everything is made up of a mixture of one or more roots, an idea that had originally been suggested by the Sicilian philosopher Empedocles. The four roots, which were later renamed as elements by Plato, were earth, water, air and fire. Similar ideas about these four elements also existed in other ancient traditions, such as Indian philosophy.

Hennig Brand

The history of the periodic table is also a history of the discovery of the chemical elements. The first person in history to discover a new element was Hennig Brand, a bankrupt German merchant. Brand tried to discover the Philosopher's Stone — a mythical object that was supposed to turn inexpensive base metals into gold. In 1669 (or later), his experiments with distilled human urine resulted in the production of a glowing white substance, which he called "cold fire" (kaltes Feuer).^[3] He kept his discovery secret until 1680, when Robert Boyle rediscovered phosphorus and published his findings. The discovery of phosphorus helped to raise the question of what it meant for a substance to be an element.

In 1661, Boyle defined an element as "those primitive and simple Bodies of which the mixt ones are said to be composed, and into which they are ultimately resolved."^[4]

Antoine-Laurent de Lavoisier

Lavoisier's Traité Élémentaire de Chimie (Elementary Treatise of Chemistry), which was written in 1789 and first translated into English by the writer Robert Kerr, is considered to be the first modern textbook about chemistry. Lavoisier defined an element as a substance that cannot be broken down into a simpler substance by a chemical reaction.^[5] This simple definition served for a century and lasted until the discovery of subatomic particles. Lavoisier's book contained a list of "simple substances" that Lavoisier believed could not be broken down further, which included oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulfur, which formed the basis for the modern list of elements. Lavoisier's list also included 'light' and 'caloric', which at the time were believed to be material substances. He classified these substances into metals and non metals. While many leading chemists refused to believe Lavoisier's new revelations, the Elementary Treatise was written well enough to convince the younger generation. However, Lavoisier's descriptions of his elements lack completeness, as he only classified them as metals and non-metals.

19th century

William Prout

In 1815, the English physician and chemist William Prout noticed that atomic weights seemed to be multiples of that of hydrogen.^[6]

Johann Wolfgang Döbereiner

In 1817, Johann Wolfgang Döbereiner, a chemist, began to formulate one of the earliest attempts to classify the elements.^[7] In 1829, he found that he could form some of the elements into groups of three, with the members of each group having related properties. He termed these groups triads.^[8]

Definition of Triad law:-"Chemically analogous elements arranged in increasing order of their atomic weights formed well marked groups of three called Triads in which the atomic weight of the middle element was found to be generally the arithmetic mean of the atomic weight of the other two elements in the triad.

1. chlorine, bromine, and iodine
2. calcium, strontium, and barium
3. sulfur, selenium, and tellurium
4. lithium, sodium, and potassium

Alexandre-Emile Béguyer de Chancourtois

John Newlands

In 1864, the English chemist John Newlands classified the sixty-two known elements into eight groups, based on their physical properties.^[12][13][14]{{r|ley196610}}

Newlands noted that many pairs of similar elements existed, which differed by some multiple of eight in mass number, and was the first to assign them an atomic number.^[15] When his 'law of octaves' was printed in Chemistry News, likening this periodicity of eights to the musical scale, it was ridiculed by some of his contemporaries. His lecture to the Chemistry Society on 1 March 1866 was not published, the Society defending their decision by saying that such 'theoretical' topics might be controversial.^[16]

The importance of Newlands' analysis was eventually recognised by the Chemistry Society with a Gold Medal five years after they recognised Mendeleev's work. It was not until the following century, with Gilbert N. Lewis's valence bond theory (1916) and Irving Langmuir's octet theory of chemical bonding (1919), that the importance of the periodicity of eight would be accepted.^[17][18][19] The Royal Chemistry Society acknowledged Newlands' contribution to science in 2008, when they put a Blue Plaque on the house where he was born, which described him as the "discoverer of the Periodic Law for the chemical elements".^[15]

He contributed the word 'periodic' in chemistry.

Julius Lothar Meyer

Meyer noted, as J. A. R. Newlands did in England, if each element is arranged in the order of their atomic weights, they fall into groups of similar chemical and physical properties repeated at periodic intervals. According to him, if the atomic weights were plotted as ordinates and the atomic volumes as abscissae—the curve obtained a series of maxima and minima—the most electro-positive elements appearing at the peaks of the curve in the order of their atomic weights.

His book, Die modernen Theorien der Chemie,^[20] which he began writing in Breslau in 1862 and which was published two years later, contained an early version of the periodic table containing 28 elements, classified elements into six families by their valence—for the first time, elements had been grouped according to their valence. Works on organizing the elements by atomic weight, until then had been stymied by inaccurate measurements of the atomic weights.

He published articles about classification table of the elements in horizontal form (1862, 1864) and vertical form (1870), in which the series of periods are properly ended by an element of the alkaline earth metal group.[4]

In 1869, a few months later than Mendeleev, Meyer published a revised and expanded version of his 1864 table independently, which was similar to that published by Mendeleev (Meyer had been sent a copy of Mendeleev's table earlier; Mendeleev had sent it to many well-known chemists of his day{{citation needed|date=January 2019}}) and a paper showing graphically the periodicity of the elements as a function of atomic weight.

In 1882, both Meyer and Mendeleev received the Davy Medal from the Royal Society in recognition of their work on the Periodic Law.

{{Anchor|1=Dmitri Ivanovich Mendeleev}} Dmitri Mendeleev

The Russian chemist Dmitri Mendeleev arranged the elements by atomic mass, corresponding to relative molar mass. It is sometimes said that he played 'chemical solitaire' on long train journeys, using cards with various facts about the known elements.^[21] On {{OldStyleDate|March 1|1869|February 17}}, he put a date on his first table, and sent it for publication.^[22] On {{OldStyleDate|18 March|1869|6 March}}, Mendeleev gave a formal presentation, The Dependence Between the Properties of the Atomic Weights of the Elements, to the Russian Chemical Society. In 1869, the table was published in an obscure Russian journal and then republished in a German journal, Zeitschrift für Chemie.^[23][24] In it, Mendeleev stated that:

1. The elements, if arranged according to their atomic mass, exhibit an apparent periodicity of properties.
2. Elements which are similar as regards to their chemical properties have atomic weights which are either of nearly the same value (e.g., Pt, Ir, Os) or which increase regularly (e.g., K, Rb, Cs).
3. The arrangement of the elements, or of groups of elements in the order of their atomic masses, corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F.
4. The elements which are the most widely diffused have small atomic weights.
5. The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.
6. We must expect the discovery of many yet unknown elements – for example, elements analogous to aluminium and silicon – whose atomic weight would be between 65 and 75.
7. The atomic weight of an element may sometimes be amended by a knowledge of those of its contiguous elements. Thus the atomic weight of tellurium must lie between 123 and 126, and cannot be 128.
8. Certain characteristic properties of elements can be foretold from their atomic masses.

• It enabled Mendeleev to predict the discovery of new elements and left spaces for them, namely eka-silicon (germanium, discovered in 1885), eka-aluminium (gallium, 1875), and eka-boron (scandium, 1879).^[25] Thus, there was no disturbance in the periodic table.
• It could be used by Mendeleev to point out that some of the atomic weights being used at the time were incorrect.
• It provided for variance from atomic weight order.

William Odling

In 1864, the English chemist William Odling also drew up a table that was remarkably similar to the table produced by Mendeleev.^[26] Odling overcame the tellurium-iodine problem and even managed to get thallium, lead, mercury and platinum into the right groups, which is something that Mendeleev failed to do at his first attempt.

Odling failed to achieve recognition, however, since it is suspected that he, as Secretary of the Chemical Society of London, was instrumental in discrediting Newlands' earlier work on the periodic table.^[16]

Shortcomings of early versions of the periodic table

• The table was not able to predict the existence of the noble gases, but did leave spaces for yet-to-be discovered elements. Time proved this method correct. When the entire group of noble gases was discovered, primarily by William Ramsay, he added them to the table as Group 0, without disturbing the basic concept of the periodic table.
• A single position could not be assigned to hydrogen, which could be placed either in the alkali metals group, the halogens group or separately above the table between boron and carbon.^[27]
• The lanthanides were difficult to fit into the table.{{r|ley196610}}

20th century

Frederick Soddy

By 1912 almost 50 different radioactive elements had been found, too many for the periodic table. Frederick Soddy in 1913 found that although they emitted different radiation, many elements were alike in their chemical characteristics so shared the same place on the table.^[28] They became known as isotopes, from the Greek {{lang|el|eisos topos}} ("same place").{{r|ley196610}}^[29]

Henry Moseley

In 1914, a year before he was killed in action at Gallipoli, the English physicist Henry Moseley found a relationship between the X-ray wavelength of an element and its atomic number.^[30] He was then able to re-sequence the periodic table by nuclear charge, rather than by atomic weight. Before this discovery, atomic numbers were sequential numbers based on an element's atomic weight. Moseley's discovery showed that atomic numbers were in fact based upon experimental measurements.

Using information about their X-ray wavelengths, Moseley placed argon (with an atomic number Z=18) before potassium (Z=19), despite the fact that argon's atomic weight of 39.9 is greater than the atomic weight of potassium (39.1). The new order was in agreement with the chemical properties of these elements, since argon is a noble gas and potassium is an alkali metal. Similarly, Moseley placed cobalt before nickel and was able to explain that tellurium occurs before iodine, without revising the experimental atomic weight of tellurium, as had been proposed by Mendeleev.

Moseley's research showed that there were gaps in the periodic table at atomic numbers 43 and 61, which are now known to be occupied by technetium and promethium respectively.

Glenn T. Seaborg

During his Manhattan Project research in 1943, Glenn T. Seaborg experienced unexpected difficulties in isolating the elements americium and curium. These elements, in addition to the elements from actinium to plutonium, were believed to form a fourth series of transition metals. Seaborg wondered if these elements belonged to a different series, which would explain why their chemical properties, in particular the instability of higher oxidation states, were different from predictions.^[31] In 1945, against the advice of colleagues, he proposed a significant change to Mendeleev's table: the actinide series.^[32]

Seaborg's actinide concept of heavy element electronic structure, predicting that the actinides form a transition series analogous to the rare earth series of lanthanide elements, is now well accepted and included in the periodic table. The actinide series is the second row of the f-block (5f series). In both the actinide and lanthanide series, an inner electron shell is being filled. The actinide series comprises the elements from actinium to lawrencium. Seaborg's subsequent elaborations of the actinide concept theorized a series of superheavy elements in a transactinide series comprising elements from 104 to 121 and a superactinide series of elements from 122 to 153.^[31]

See also

• Alternative periodic tables
• History of chemistry
• List of periodic table-related articles
• Periodic Systems of Small Molecules
• Prout's hypothesis
• The Mystery of Matter: Search for the Elements (PBS film)
• Timeline of chemical element discoveries

References

External links

• Development of the periodic table (part of a collection of pages that explores the periodic table and the elements) by the Royal Society of Chemistry
• Dr. Eric Scerri's web page, which has links to interviews, lectures and articles on various aspects of the periodic system, including the history of the periodic table.
• The Internet Database of Periodic Tables – a large collection of periodic tables and periodic system formulations.
• History of Mendeleev periodic table of elements as a data visualization at CrossValidated Stack Exchange

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