Anaya Nolan
The Periodic Law was formulated by Russian chemist Dmitri Mendeleev in 1869. Mendeleev is often referred to as the Father of the Periodic Table and his work built upon that of several other scientists, including British chemist John Newlands, who first arranged the elements into a periodic table with increasing order of atomic masses. Mendeleev's law stated that elements arranged according to the value of their atomic weights present a clear periodicity of properties, and he used this law to create a framework for the modern periodic table, leaving gaps for elements that were yet to be discovered.
| Characteristics | Values |
|---|---|
| Date | 6 March 1869 |
| Creator | Dmitri Mendeleev |
| Other names | The Periodic System, The Dependence between the Properties of the Atomic Weights of the Elements |
| Basis | Arranging all known chemical elements in order of increasing atomic weight |
| Result | A recurring pattern, or periodicity, of properties within groups of elements |
| Gaps | Left spaces for unknown elements and predicted their likely properties |
| Number of elements | 70 |
Explore related products
What You'll Learn
The work of John Newlands
John Alexander Reina Newlands, born on 26 November 1837 in London, England, was a British chemist who made significant contributions to the development of the periodic law. Newlands studied at the Royal College of Chemistry in London and had a strong interest in social reform. He volunteered with Giuseppe Garibaldi in his campaign to unify Italy in 1860 before returning to London and establishing himself as an analytical chemist in 1864.
Newlands was the first person to devise a periodic table of chemical elements arranged in order of their relative atomic masses. He published his work in Chemical News in February 1863, continuing the work of Johann Wolfgang Döbereiner and Jean-Baptiste Dumas. In 1865, he published his "Law of Octaves", which stated that "any given element will exhibit analogous behaviour to the eighth element following it in the table." Newlands arranged all the known elements, from hydrogen to thorium, into eight groups of seven, drawing a comparison to the octaves of music.
Newlands' table exhibited a repeating or periodic pattern of properties, but it had some issues. For example, he placed iron in the same group as oxygen and sulfur, which are non-metals. As a result, his work was not initially accepted by his contemporaries or the Society of Chemists. Despite this, Newlands' Law of Octaves contributed significantly to the development of the periodic law.
After Dmitri Mendeleev and Lothar Meyer received the Davy Medal from the Royal Society for their subsequent 'discovery' of the periodic table, Newlands fought for recognition of his earlier work. He was eventually awarded the Davy Medal in 1887, and in 1998, the Royal Society of Chemistry placed a commemorative plaque at his birthplace, recognising his discovery.
Natural Law Theory: When and How It Began
You may want to see also
Explore related products
The work of Antoine Lavoisier
The periodic law, or the modern periodic table, arranges elements by their atomic numbers and periodic properties. The earliest attempt to classify elements was in 1789 by Antoine Lavoisier, who grouped the elements based on their properties into gases, non-metals, metals, and earths. Lavoisier's work on the periodic table was just one of his many contributions to the field of chemistry.
Antoine Lavoisier was a prominent French chemist and a leading figure in the 18th-century chemical revolution. He revolutionized chemistry by naming the elements carbon, hydrogen, and oxygen, and by discovering oxygen's role in combustion and respiration. He established that water is a compound of hydrogen and oxygen, and discovered that sulfur is an element. Lavoisier also helped transform chemistry from a qualitative science into a quantitative one. He recognized hydrogen as an element in 1783 and named oxygen in 1778, identifying it as an element.
Lavoisier's experiments supported the law of conservation of mass. In France, this is known as Lavoisier's Law and is paraphrased from his Traité Élémentaire de Chimie: "Nothing is lost, nothing is created, everything is transformed." He also helped develop the metric system of measurements with his wife and laboratory assistant, Marie-Anne Paulze Lavoisier, who was a renowned chemist in her own right.
Lavoisier was born into a wealthy family in Paris on August 26, 1743. He studied the humanities and sciences at the Collège Mazarin before studying law. However, he spent much of his time attending lectures on physics and chemistry and working with leading scientists. Lavoisier's scientific research gained him admission to France's Academy of Sciences in Paris in 1768. During his lifetime, he was recognized with a gold medal from the King of France for his work on urban street lighting in 1766. He was also appointed to the French Academy of Sciences and elected as a member of the American Philosophical Society in 1775.
Lavoisier married Marie-Anne Pierrette Paulze, the 13-year-old daughter of a senior member of the Ferme générale, in 1771. Marie-Anne played an important role in Lavoisier's scientific career, translating English documents, assisting in the laboratory, and creating sketches and engravings of laboratory instruments. She also edited and published Lavoisier's memoirs.
Despite his contributions to science, Lavoisier was branded a traitor during the French Revolution due to his involvement with taxation. He was sentenced to death and guillotined in 1794. However, a year and a half later, he was exonerated by the French government.
The Evolution of Employment Law: A Historical Perspective
You may want to see also
Explore related products
![Inorganic chemistry according to the periodic law, by F. P. Venable ... and Jas. Lewis Howe. 1898 [Leather Bound]](https://m.media-amazon.com/images/I/81nNKsF6dYL._AC_UY218_.jpg)
The work of Johann Döbereiner
In the early 19th century, German chemist Johann Wolfgang Döbereiner observed that certain properties of the elements seemed to recur at regular intervals when they were arranged in order of their atomic weights. He noted that some elements could be grouped into triads based on their chemical properties. Each triad contained three elements: the first and third elements were similar in chemical behavior and had properties similar to the middle element but differed in their measurements. For example, he placed calcium, strontium, and barium in one triad and sulfur, selenium, and tellurium in another. Döbereiner's work was an important contribution to the development of periodic law, but his triads were limited and did not account for all the elements.
Döbereiner made significant contributions to the early understanding of the periodicity of elements. He was born in 1780 and became a professor of chemistry and pharmacy in Jena, Germany. He is known for his work on the grouping of elements, but he also made important discoveries in other areas of chemistry. Döbereiner's research on the composition of natural waters and the analysis of mineral waters was influential in the development of analytical chemistry. He also studied the effects of platinum on hydrogen combustion and discovered that irradiating a mixture of hydrogen and oxygen with an electric spark produced water.
Döbereiner's most notable work, however, was his grouping of the elements. He observed that some elements could be arranged in groups of three, or triads, based on their chemical properties. The middle element of each triad had a mass approximately equal to the average of the other two. For example, in the triad of calcium (40), strontium (88), and barium (137), the mass of strontium is close to the average mass of calcium and barium. Döbereiner also noted that the chemical properties of the middle element were often a combination of the other two.
Döbereiner's triads provided early evidence of the periodicity of elements, but they had limitations. They only worked for a small number of elements, and not all elements could be grouped into triads. Additionally, the atomic weights of some elements did not fit neatly into the triad pattern. Despite these limitations, Döbereiner's work was an important step towards the development of the periodic law. His observations influenced later chemists, including John Newlands and Dmitri Mendeleev, who built upon Döbereiner's ideas and contributed to the creation of the periodic table.
Döbereiner's work also extended beyond the grouping of elements. He discovered butane and studied the properties of platinum and other metals. He was also interested in the improvement of laboratory techniques and equipment, and he invented the Döbereiner's lamp, which was a type of hydrogen gas blowpipe used for soldering and the fine analysis of minerals. This lamp was an important tool for chemists and jewelers in the 19th century. Döbereiner was also known for his teaching and mentorship. He taught and influenced many students, including Alexander von Humboldt, who became a notable naturalist and explorer.
In summary, Johann Döbereiner's work on the grouping of elements into triads provided early evidence of the periodicity of the elements. His observations and research influenced later chemists and contributed to the development of the periodic law and the creation of the periodic table. Döbereiner's contributions extended beyond his work on the elements, as he made important discoveries in various fields of chemistry and invented useful laboratory equipment. His work continues to be recognized and remembered in the historical development of the periodic law.
The Evolution of Patent Law: A Historical Overview
You may want to see also
Explore related products
The work of Lothar Meyer
Julius Lothar Meyer was a German chemist who played a significant role in developing the earliest versions of the periodic table of chemical elements. He is best known for his work in the periodic classification of elements. Meyer's work in this field was independent of Dmitry Mendeleyev, his chief rival.
Meyer's interest in chemistry and physics began during his time at Heidelberg University, where he studied under Robert Bunsen, who also taught Mendeleev. Meyer's early career focused on medicine, and he graduated as a Doctor of Medicine from the University of Würzburg in 1854. However, his interest in chemistry and physics led him to pursue a career in science education, and he began teaching chemistry and physics in 1859.
Meyer's most notable contribution to the development of the periodic table was his book "Die modernen Theorien der Chemie" ("Modern Chemical Theory"), published in 1864. This book contained an early version of the periodic table, grouping 28 elements into six families based on their valence. Meyer's table was the first to classify elements by their valency, or how many other atoms they can combine with. This work built upon his previous research into the relationships between the properties and atomic weights of elements.
Meyer continued to refine his periodic table, and in 1868, he prepared an expanded version similar to Mendeleev's table published in 1869. However, it was not until 1870 that Meyer published his own table, a graph relating atomic volume and atomic number, clearly showing the periodic relationships between elements. Meyer's 1870 table included gaps for undiscovered elements, but he did not predict their properties as Mendeleev had done. Meyer's work on the periodic table and his contributions to chemistry were recognized in 1882 when he was awarded the Davy Medal by the Royal Society, alongside Mendeleev.
Islamic Penal Law: When Did It Begin?
You may want to see also
Explore related products
The work of Dmitri Mendeleev
Dmitri Mendeleev, often referred to as the "Father of the Periodic Table", was a Russian chemist and physicist who discovered and created the periodic table of elements. Mendeleev found that when all the known chemical elements were arranged in order of increasing atomic weight, a recurring pattern of properties within groups of elements was revealed.
In 1865, Mendeleev became a professor of chemical technology at the University of St. Petersburg. He became a professor of general chemistry there in 1867, teaching until 1890. Mendeleev wrote the "Principles of Chemistry", which became the definitive textbook of its time. In 1869, Mendeleev unveiled his periodic table, quickly gaining recognition for his way of arranging elements according to likeness in weight and chemical reactivity. He called his table or matrix, "the Periodic System". Mendeleev's table was not accepted by everyone, as he did not place all elements in ascending atomic mass order. Some elements were swapped and misplaced.
Mendeleev questioned some of the accepted atomic weights at the time, pointing out that they did not correspond to those suggested by his Periodic Law. He noted that tellurium has a higher atomic weight than iodine, but he placed them in the right order, incorrectly predicting that the accepted atomic weights were at fault. Mendeleev was puzzled about where to put the known lanthanides and predicted the existence of another row to the table, which were the actinides, some of the heaviest in atomic weight. Some people dismissed Mendeleev for predicting that there would be more elements, but he was proven right when gallium and germanium were discovered in 1875 and 1886, fitting into the two missing spaces.
In 1871, Mendeleev left gaps in places where he believed unknown elements would find their place. He even predicted the likely properties of three potential elements. The subsequent proof of many of his predictions within his lifetime brought fame to Mendeleev as the founder of the periodic law. The later discovery of elements predicted by Mendeleev, including gallium (1875), scandium (1879), and germanium (1886), verified his predictions and his periodic table won universal recognition. In 1955, the 101st element was named mendelevium in his honour.
History of Breed-Specific Laws: When and Why?
You may want to see also
Frequently asked questions
Russian chemist, Dmitri Mendeleev is often referred to as the Father of the Periodic Table.
Mendeleev created the framework that became the modern periodic table in 1869.
Mendeleev created a framework for the periodic table by arranging the elements according to their atomic weight. He also left gaps for elements that were yet to be discovered.
Mendeleev worked independently on the periodic table. However, German chemist Lothar Meyer also produced a version of the periodic table similar to Mendeleev's in 1870.
