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The Periodic Table: a Window to the History of Chemistry! Savita Ladage & Tejas Joshi

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The Periodic Table: a Window to the History of Chemistry! Savita Ladage & Tejas Joshi 8- ANNALS OF HISTORY THE PERIODIC TABLE: A WINDOW TO THE HISTORY OF CHEMISTRY! SAVITA LADAGE & TEJAS JOSHI The periodic table is central he periodic table is an integral part Early attempts to identify to chemistry education, of the chemistry we study today. natural elements and it can be just as central TBut, have you ever wondered how in exploring the inspiring elements were discovered? Or, how the The belief that all matter in the world history and evolution of periodic table has evolved to its present around us is made up of a limited pool of chemistry as a subject. This structure and format – especially in the building blocks has persisted since ancient article embarks on this absence of advanced analytical techniques, times. This has led to numerous attempts, historical journey, with the instruments or accessible literature? The from different civilisations, to identify these objective of showcasing its answers to these questions lie in the building blocks. value for both teachers and unflinching human quest for knowledge, One such attempt identified four students. a logical approach, and a great deal of elementary substances – Water, Air, Fire and foresight. As lucid and organized as it Earth. Aristotle added one more element – may appear today, the periodic table is in ‘Aether’, the element of the heavens, to this fact a reflection of the challenging and list. These finite building blocks were put uphill evolution of the very subject of together in a preliminary, but convincing, chemistry. Thus, learning about its history ‘table’ – becoming one of the first efforts is as invaluable for a teacher as it is for a to classify elements. Even back then, these learner… elementary substances were used to make sense of natural phenomena (refer Fig1)! Fig. 1. A preliminary table of natural elements. This very old precursor, by Aristotle, to the modern periodic table might have been a modest beginning, but it worked well in explaining natural phenomena. For example, the presence/absence of fire explained hot and cold respectively. The absence of water implied a solid. Thus observing ash and experiencing heat following the burning of wood, wood was believed to be made up of earth and fire. Credits: Tejas Joshi. License: CC-BY-NC REDISCOVERING SCHOOL SCIENCE 37 This simple, but reasonably rational, However, the first written record unique means of decomposition. It was classification prevailed for many documenting the discovery of an successfully deployed by Sir Humphry centuries. However, beginning with element dates back to 1669. The Davy to isolate the extremely reactive the work of alchemists (ancestors of element it describes is Phosphorus, Sodium and Potassium in 1807 and modern chemists), and later as a result discovered from urine, a natural source other alkaline earths like Calcium, of progress in experimental sciences, the of phosphates. Magnesium and Barium subsequently. concept of chemical elements began The reducing ability of potassium, While it is possible that many more witnessing a considerable change. in turn, helped Jöns Jacob Berzelius elements were discovered in this period, discover Selenium, Silicon, and it is difficult for us to establish the Zirconium etc. What are chemical existence of this knowledge. Alchemists elements? of this period relied heavily on trial and The gradual increase in the number of The discovery of chemical elements error. Also, given the potential economic known elements was accompanied by dates back to prehistoric times, when benefits that their discoveries might the evolution of ideas regarding the humans observed charcoal (Carbon) bring them, they tended to refrain from atom and atomic mass in the early being left behind from the burning of disclosing their learning. This meant that nineteenth century. Both these aspects wood in forest fires. knowledge was more likely to remain became important stepping stones An awareness of as many as seven isolated, and its development did not in subsequent attempts to classify metals – Gold, Silver, Copper, Lead, Iron, progress methodically. elements. The atomic theory proposed Tin and Mercury, and the non-metal by John Dalton in the beginning of Sulphur (apart from Carbon) – can Experimental science and the nineteenth century is particularly be traced back to ancient times. This the new concept of the significant in this context. Dalton may have been because many of these element suggested that elements were made up elements occur naturally, either in of indivisible particles, called ‘atoms’. The first significant shift in our ideas free (elemental) forms or in ores like His idea that all atoms of a particular sulphides and oxides, and are easily about elements came from the work element were identical – in terms decomposed by simple heating or of Robert Boyle in the seventeenth of their mass, size and properties – heating in the presence of charcoal. century. Boyle defined an element as focussed attention on the important It is also possible that once they were being a substance that could not be concept of atomic mass. According to discovered, their utility or importance broken down into simpler constituents, Dalton, the exact value for the atomic to humans may have driven their and could combine with other elements mass of an element could be thought of further identification. However, we to form a mixture (today’s compound). as being the signature of that element. have little documentation of either – Extensive work by scientists like This idea led to the question: how do their discovery, or their recognition as Henry Cavendish, Joseph Priestley and we calculate the atomic mass of an elements. Antoine Lavoisier in the eighteenth element? Dalton displayed remarkable century demonstrated this concept foresight in calculating this value In this context, the history of Gold experimentally. is particularly significant. Due to its relative to another element whose mass attractive lustre, Gold (along with Silver) Cavendish discovered a flammable gas was known (i.e. Hydrogen as a reference became a symbol of wealth (ornaments) (produced by the reaction of acid and element to predict relative masses of and beauty, gradually assuming metal), christened Hydrogen, at around other elements). significance as a medium of exchange the same time that Priestley discovered and international trade. Consequently, a gas, christened Oxygen, which many alchemists began to seek this supported burning. Lavoisier’s milestone ‘Philosopher’s Stone’ by attempting to synthesis of water using the two was convert other base metals, like Iron, the first major blow to Aristotle’s choice into Gold. It was these attempts by of elements. Lavoisier also established alchemists from the Middle Ages that the conservation of mass in chemical led to the discovery of many other reactions and provided a basis for elements, like Antimony, Arsenic and writing chemical reactions. Bismuth. It also led to the development of a variety of glassware as well as An invention that played a vital role the discovery of three major acids – in the discovery of new elements was sulphuric, hydrochloric and nitric, all of the construction of the Volta’s cell in which have been crucial for subsequent 1800. The Volta’s cell provided a steady experimental research. source of electricity and, thereby, a 38 Box 1. Atoms or molecules? Periodicity in chemical Remarkably, at this point of time, the chemical formulae of compounds was not known, properties of elements nor was the concept of valence. However, the law of conservation of mass (Lavoisier) and Following the 1860 Congress, the the law of constant proportion (Proust) had already been established. The law of constant considerable number of known elements proportion by Proust states that irrespective of its source, a particular compound (say water) is made up of the same elements (hydrogen and oxygen) present in a constant (63) and clarifications about their mass ratio (1:8) throughout. Keeping hydrogen as a reference, and assuming the simplest atomic masses, valence etc. provided the formula of water to be HO, Dalton concluded the atomic mass of oxygen to be 8. appropriate reference points needed to Gay-Lussac was working with chemical reactions in gaseous phase, and suggested that organize this information. atoms need not be the smallest particles in an element to have independent existence. Gay-Lussac’s results were in conflict with Dalton’s postulate of the indivisibility of an John Newlands was the first to identify atom. This conflict was finally resolved by Avogadro who proposed the idea of ‘molecules’. a certain ‘periodicity’ in the chemical properties of elements. Newlands The concept of atomic mass and its calculating them, based on Avogadro’s observed that when arranged in order determination was further developed hypothesis, was presented at the of their increasing atomic masses in the period between 1800 and 1860 Congress. This landmark gathering thus (as calculated by Cannizzaro), every by Gay-Lussac, Amedeo Avogadro, laid the foundation for serious and eighth element to appear in sequence Berzelius, Jean Stas and Stanislao concerted efforts to reflect on existing from a given starting element in his Cannizzaro. Berzelius changed the knowledge about elements and their arrangement was similar to each other reference element from Hydrogen to properties. (refer Figure 2). He called this peculiar Oxygen, broadening the canvas of property the ‘Law of Octaves’ given its chemical assays by making use of readily Box 3. Triads of elements. similarity to the musical octave. available oxides. This historic notion of Even though most attempts at The fact that Newlands relied more on using some reference for calculating classifying elements happened after atomic masses of elements, rather than atomic masses is still very much in use – the Karlsruhe Congress, there were with the 12C isotope being the standard some noteworthy attempts prior to it, their physical and chemical properties, today. notably Dobereiner’s work. Dobereiner’s resulted in some limitations in his categorization of elements was arrangement.
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