Dmitri Ivanovich Mendeleev (1834 – 1907), Prominent Russian Scientist
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The Practice of Chemistry Education (Paper)
CHEMISTRY EDUCATION: THE PRACTICE OF CHEMISTRY EDUCATION RESEARCH AND PRACTICE (PAPER) 2004, Vol. 5, No. 1, pp. 69-87 Concept teaching and learning/ History and philosophy of science (HPS) Juan QUÍLEZ IES José Ballester, Departamento de Física y Química, Valencia (Spain) A HISTORICAL APPROACH TO THE DEVELOPMENT OF CHEMICAL EQUILIBRIUM THROUGH THE EVOLUTION OF THE AFFINITY CONCEPT: SOME EDUCATIONAL SUGGESTIONS Received 20 September 2003; revised 11 February 2004; in final form/accepted 20 February 2004 ABSTRACT: Three basic ideas should be considered when teaching and learning chemical equilibrium: incomplete reaction, reversibility and dynamics. In this study, we concentrate on how these three ideas have eventually defined the chemical equilibrium concept. To this end, we analyse the contexts of scientific inquiry that have allowed the growth of chemical equilibrium from the first ideas of chemical affinity. At the beginning of the 18th century, chemists began the construction of different affinity tables, based on the concept of elective affinities. Berthollet reworked this idea, considering that the amount of the substances involved in a reaction was a key factor accounting for the chemical forces. Guldberg and Waage attempted to measure those forces, formulating the first affinity mathematical equations. Finally, the first ideas providing a molecular interpretation of the macroscopic properties of equilibrium reactions were presented. The historical approach of the first key ideas may serve as a basis for an appropriate sequencing of -
The History of the Concept of Element, with Particular Reference to Humphry Davy
The Physical Sciences Initiative The history of the concept of element, with particular reference to Humphry Davy One of the problems highlighted when the recently implemented chemistry syllabus was being developed was the difficulty caused by starting the teaching of the course with atoms. The new syllabus offers a possible alternative teaching order that starts at the macroscopic level, and deals with elements. If this is done, the history of the idea of elements is dealt with at a very early stage. The concept of element originated with the ancient Greeks, notably Empedocles, who around 450 BC defined elements as the basic building blocks from which all other materials are made. He stated that there were four elements: earth, air, fire and water. Substances were said to change when elements break apart and recombine under the action of the forces of strife and love. Little progress was made in this area until the seventeenth century AD. The fruitless attempts of the alchemists to change base metals such as lead into gold and to find the “elixir of life” held back progress, although much chemical knowledge and expertise was gained. In 1661, 1 The Physical Sciences Initiative The Physical Sciences Initiative Robert Boyle defined an element as a substance that cannot be broken down into simpler materials. He cast doubt on the Greek elements, and provided a criterion for showing that a material was not an element. Robert Boyle Many elements were discovered during the next 100 years, but progress was delayed by the phlogiston hypothesis. According to this hypothesis, when a substance was burned it lost a substance called phlogiston to the air. -
Historical Development of the Periodic Classification of the Chemical Elements
THE HISTORICAL DEVELOPMENT OF THE PERIODIC CLASSIFICATION OF THE CHEMICAL ELEMENTS by RONALD LEE FFISTER B. S., Kansas State University, 1962 A MASTER'S REPORT submitted in partial fulfillment of the requirements for the degree FASTER OF SCIENCE Department of Physical Science KANSAS STATE UNIVERSITY Manhattan, Kansas 196A Approved by: Major PrafeLoor ii |c/ TABLE OF CONTENTS t<y THE PROBLEM AND DEFINITION 0? TEH-IS USED 1 The Problem 1 Statement of the Problem 1 Importance of the Study 1 Definition of Terms Used 2 Atomic Number 2 Atomic Weight 2 Element 2 Periodic Classification 2 Periodic Lav • • 3 BRIEF RtiVJiM OF THE LITERATURE 3 Books .3 Other References. .A BACKGROUND HISTORY A Purpose A Early Attempts at Classification A Early "Elements" A Attempts by Aristotle 6 Other Attempts 7 DOBEREBIER'S TRIADS AND SUBSEQUENT INVESTIGATIONS. 8 The Triad Theory of Dobereiner 10 Investigations by Others. ... .10 Dumas 10 Pettehkofer 10 Odling 11 iii TEE TELLURIC EELIX OF DE CHANCOURTOIS H Development of the Telluric Helix 11 Acceptance of the Helix 12 NEWLANDS' LAW OF THE OCTAVES 12 Newlands' Chemical Background 12 The Law of the Octaves. .........' 13 Acceptance and Significance of Newlands' Work 15 THE CONTRIBUTIONS OF LOTHAR MEYER ' 16 Chemical Background of Meyer 16 Lothar Meyer's Arrangement of the Elements. 17 THE WORK OF MENDELEEV AND ITS CONSEQUENCES 19 Mendeleev's Scientific Background .19 Development of the Periodic Law . .19 Significance of Mendeleev's Table 21 Atomic Weight Corrections. 21 Prediction of Hew Elements . .22 Influence -
The Development of the Periodic Table and Its Consequences Citation: J
Firenze University Press www.fupress.com/substantia The Development of the Periodic Table and its Consequences Citation: J. Emsley (2019) The Devel- opment of the Periodic Table and its Consequences. Substantia 3(2) Suppl. 5: 15-27. doi: 10.13128/Substantia-297 John Emsley Copyright: © 2019 J. Emsley. This is Alameda Lodge, 23a Alameda Road, Ampthill, MK45 2LA, UK an open access, peer-reviewed article E-mail: [email protected] published by Firenze University Press (http://www.fupress.com/substantia) and distributed under the terms of the Abstract. Chemistry is fortunate among the sciences in having an icon that is instant- Creative Commons Attribution License, ly recognisable around the world: the periodic table. The United Nations has deemed which permits unrestricted use, distri- 2019 to be the International Year of the Periodic Table, in commemoration of the 150th bution, and reproduction in any medi- anniversary of the first paper in which it appeared. That had been written by a Russian um, provided the original author and chemist, Dmitri Mendeleev, and was published in May 1869. Since then, there have source are credited. been many versions of the table, but one format has come to be the most widely used Data Availability Statement: All rel- and is to be seen everywhere. The route to this preferred form of the table makes an evant data are within the paper and its interesting story. Supporting Information files. Keywords. Periodic table, Mendeleev, Newlands, Deming, Seaborg. Competing Interests: The Author(s) declare(s) no conflict of interest. INTRODUCTION There are hundreds of periodic tables but the one that is widely repro- duced has the approval of the International Union of Pure and Applied Chemistry (IUPAC) and is shown in Fig.1. -
Dmitri Mendeleev
DOWNLOADABLE EXTRAS Atomic Structure: Part 1 1 Dmitri Mendeleev Dmitri Mendeleev was born on the 8th of February 1834 in Siberia, Russia. His father who was a teacher of the arts and politics, died when he was only thirteen. He was one of a large family and is thought to possibly have had 17 brothers and sisters. Due to his father’s death and a failed family business (a glass factory that burnt down) the family were very poor. Despite this, his mother wanted him to be educated at a higher level so she moved the family to St Petersburg in order for Dmitri to attend school. After graduating he became a teacher in the area of science. His passion was chemistry and he studied the capillarity of liquids (ability of a liquid to fl ow in a narrow space without any suction or pumping, like when water moves against gravity up a straw placed in a glass of water), the components of petrol and the spectroscope (a device that uses light to identify unknown materials). Because chemistry at the time was so disorganised, Mendeleev saw a need to establish a set of rules and guidelines that would be universal (able to be used across the world). He started by writing two very successful text books that included all of his chemistry knowledge. However he felt that this wasn’t enough and that the concepts of chemistry were too broad and unlinked. In 1869 he started to write a system that ordered the elements as these were the main concept behind a lot of other chemistry. -
Robert Wilhelm Bunsen Und Sein Heidelberger Laboratorium Heidelberg, 12
Historische Stätten der Chemie Robert Wilhelm Bunsen und sein Heidelberger Laboratorium Heidelberg, 12. Oktober 2011 Gesellschaft Deutscher Chemiker 1 Mit dem Programm „Historische Stätten der Chemie“ würdigt Robert Wilhelm Bunsen – die Gesellschaft Deutscher Chemiker (GDCh) Leistungen von geschichtlichem Rang in der Chemie. Als Orte der Erinnerung eine biographische Skizze werden Wirkungsstätten beteiligter Wissenschaftlerinnen und Wissenschaftler in einem feierlichen Akt ausgezeichnet. Eine Broschüre bringt einer breiten Öffentlichkeit deren wissenschaft- Bunsen war einer der Wegbereiter der Physikalischen Chemie liches Werk näher und stellt die Tragweite ihrer Arbeiten im und ein bedeutender Vertreter der anorganisch-analytischen aktuellen Kontext dar. Ziel dieses Programms ist es, die Erinne- Richtung. Seine wissenschaftliche Bedeutung liegt in der Ent- rung an das kulturelle Erbe der Chemie wach zu halten und die wicklung und Perfektionierung von Methoden und Instrumen- Chemie mit ihren historischen Wurzeln stärker in das Blickfeld ten. Diese Arbeitsschwerpunkte hat Bunsen von Beginn seiner der Öffentlichkeit zu rücken. Karriere an verfolgt und systematisch ausgebaut. Am 12. Oktober 2011 gedenken die GDCh, die Deutsche 1811 als jüngster von vier Söhnen einer bürgerlichen protestan- Bunsen-Gesellschaft für Physikalische Chemie (DBG), die Che- tischen Familie in Göttingen geboren, begann Bunsen dort 1828 mische Gesellschaft zu Heidelberg (ChGzH) und die Ruprecht- das Studium der Naturwissenschaften. Seine wichtigsten Lehrer Karls-Universität -
Milestones and Personalities in Science and Technology
History of Science Stories and anecdotes about famous – and not-so-famous – milestones and personalities in science and technology BUILDING BETTER SCIENCE AGILENT AND YOU For teaching purpose only December 19, 2016 © Agilent Technologies, Inc. 2016 1 Agilent Technologies is committed to the educational community and is willing to provide access to company-owned material contained herein. This slide set is created by Agilent Technologies. The usage of the slides is limited to teaching purpose only. These materials and the information contained herein are accepted “as is” and Agilent makes no representations or warranties of any kind with respect to the materials and disclaims any responsibility for them as may be used or reproduced by you. Agilent will not be liable for any damages resulting from or in connection with your use, copying or disclosure of the materials contained herein. You agree to indemnify and hold Agilent harmless for any claims incurred by Agilent as a result of your use or reproduction of these materials. In case pictures, sketches or drawings should be used for any other purpose please contact Agilent Technologies a priori. For teaching purpose only December 19, 2016 © Agilent Technologies, Inc. 2016 2 Table of Contents The Father of Modern Chemistry The Man Who Discovered Vitamin C Tags: Antoine-Laurent de Lavoisier, chemical nomenclature Tags: Albert Szent-Györgyi, L-ascorbic acid He Discovered an Entire Area of the Periodic Table The Discovery of Insulin Tags: Sir William Ramsay, noble gas Tags: Frederick Banting, -
NATURE 591 ACOUSTICAL QUANTA and the Zontalline at the 'Epoch' T
No. 4044 May 3, 1947 NATURE 591 ACOUSTICAL QUANTA AND THE zontalline at the 'epoch' t. These are extreme cases. In general, signals cannot be represented by lines ; THEORY OF HEARING but it is possible to associate with them a certain characteristic rectangle or 'cell' by the following By DR. D. GABOR process, which at first sight might perhaps appear British Thomson-Houston Co. Research Laboratory, Rugby somewhat complicated. Consider a given signal described as s(t) in 'time N popular expositions of wave mechanics, acoustical language' and by its Fourier transform S(f) in I illustrations have been used by several authors, 'frequency language'. If s(f) is real, S(j) will be in with particular success by Lande1 • In a recent paper general complex, and the spectrum will extend over on the "Theory of Communication"• I have taken both ppsitive and negative frequencies. This creates the opposite course. Acoustical phenomena are dis an unwelcome asymmetry between the two repre cussed by mathematical methods closely related to sentations, which can be eliminated by operating those of quantum theory. While in physical acoustics with a complex signal ljl(t) = s(t) + icr(t), where cr(t) a new formal approach to old problems cannot be is the Hilbert transform of s(t), instead of with the expected to reveal much that is not already known, real signals(t). This choice makes the Fourier trans the position in subjective acoustics is rather different. form 'P(f) of ljl(t) zero for all negative frequencies. In fact, the new methods have already proved their Next we define the 'energy density' of the signal as heuristic value, and can be expected to throw more ljlljl*, where the asterisk denotes the conjugate com light on the theory of hearing. -
Unit 5.1 Periodic Table: Its Structure and Function
Unit 5.1 Periodic Table: Its Structure and Function Teacher: Dr. Van Der Sluys Objectives • Mendeleev • Information in the Periodic Table – Metals, nonmetals and metalloids – Main Group, Transition Metals, Rare Earth and Actinide Dmitri Mendeleev (1869) In 1869 Mendeleev and Lothar Meyer (Germany) published nearly identical classification schemes for elements known to date. The periodic table is base on the similarity of properties and reactivities exhibited by certain elements. Later, Henri Moseley ( England,1887-1915) established that each elements has a unique atomic number, which is how the current periodic table is organized. http://www.chem.msu.su/eng/misc/mendeleev/welcome.html 1 Information About Each Element Atomic Number 1 H Atomic Symbol Average Atomic 1.00794 Mass Periodic Table Expanded View •The way the periodic table usually seen is a compress view, placing the Lanthanides and actinides at the bottom of the stable. •The Periodic Table can be arrange by subshells. The s-block is Group IA and & IIA, the p-block is Group IIIA - VIIIA. The d-block is the transition metals, and the f-block are the Lanthanides and Actinide metals 2 Periodic Table: Metals and Nonmetals 1 18 IA VIIIA 2 13 14 15 16 17 1 IIA IIIA IVA VA VIA VIIA • Layout of the Periodic Table: Metals vs. nonmetals 2 3 4 5 6 7 8 9 10 11 12 3 IIIB IVB VB VIB VIIB VIIIB IB IIB 4 Nonmetals 5 Metals 6 7 Periodic Table: Classification • Metals - Solids, luster, conduct heat and electricity, malleable and ductile • Nonmetals - Gases, liquids or low melting solids that are sometimes brittle and nonconducting • Metalloids - Have properties of both metals and nonmetals. -
Guides to the Royal Institution of Great Britain: 1 HISTORY
Guides to the Royal Institution of Great Britain: 1 HISTORY Theo James presenting a bouquet to HM The Queen on the occasion of her bicentenary visit, 7 December 1999. by Frank A.J.L. James The Director, Susan Greenfield, looks on Front page: Façade of the Royal Institution added in 1837. Watercolour by T.H. Shepherd or more than two hundred years the Royal Institution of Great The Royal Institution was founded at a meeting on 7 March 1799 at FBritain has been at the centre of scientific research and the the Soho Square house of the President of the Royal Society, Joseph popularisation of science in this country. Within its walls some of the Banks (1743-1820). A list of fifty-eight names was read of gentlemen major scientific discoveries of the last two centuries have been made. who had agreed to contribute fifty guineas each to be a Proprietor of Chemists and physicists - such as Humphry Davy, Michael Faraday, a new John Tyndall, James Dewar, Lord Rayleigh, William Henry Bragg, INSTITUTION FOR DIFFUSING THE KNOWLEDGE, AND FACILITATING Henry Dale, Eric Rideal, William Lawrence Bragg and George Porter THE GENERAL INTRODUCTION, OF USEFUL MECHANICAL - carried out much of their major research here. The technological INVENTIONS AND IMPROVEMENTS; AND FOR TEACHING, BY COURSES applications of some of this research has transformed the way we OF PHILOSOPHICAL LECTURES AND EXPERIMENTS, THE APPLICATION live. Furthermore, most of these scientists were first rate OF SCIENCE TO THE COMMON PURPOSES OF LIFE. communicators who were able to inspire their audiences with an appreciation of science. -
Recalling Radon's Recognition
in your element Recalling radon’s recognition Brett F. Thornton and Shawn C. Burdette look back at the discovery — and the many different names — of element 86. n 1899, Pierre and Marie Curie noted an Thoron, unlike radon, requires no such “induced radioactivity” — left behind by clarification, and 220Rn is routinely called Iradium, distinct from its own radioactivity. thoron today. Thoron is far easier to say Ernest Rutherford and Robert B. Owens also than ‘radon-two-twenty’, perhaps explaining reported that year on a radioactive substance why the annual count of scientific papers 220 ( Rn, t1/2 = 55.6 s) emitted by thorium, which mentioning thoron has increased over twenty- they called emanation. In 1900, Friedrich fold since thoron was ‘disallowed’ in 1957. Dorn realized that the Curies had observed a Distinguishing between 222Rn (the 222 220 unique substance ( Rn, t1/2 = 3.8 d), similar isotope called ‘radon’) and Rn (thoron) is to emanation. In 1904, André-Louis Debierne not of idle linguistic and historic interest. 222 found a third radioactive particle; this one © SUPERSTOCK/ALAMY Rn can persist indoors, whereas the short- 219 produced from actinium ( Rn, t1/2 = 4 s). lived thoron cannot. Not all home radon These were at first regarded as elements and actinon (An) for the three isotopes; detectors (pictured) are sensitive to thoron, and became colloquially known as thorium names suggested by Elliott Q. Adams. and thoron-sensitive detectors must be emanation, radium emanation and actinium An official statement on a name for all placed with care because thoron does not emanation, but today we recognize them three isotopes — that is, a name for the travel far from its source. -
Dmitry I. Mendeleev and His Time
Firenze University Press www.fupress.com/substantia Historical Article Dmitry I. Mendeleev and his time Citation: D. Pushcharovsky (2019) Dmitry I. Mendeleev and his time. Sub- Dmitry Pushcharovsky stantia 3(1): 119-129. doi: 10.13128/ Substantia-173 Lomonosov Moscow State University, Department of Geology, Vorob’evy gori, 1, 119899 Moscow, Russia Copyright: © 2019 D. Pushcharovsky. E-mail: [email protected] This is an open access, peer-reviewed article published by Firenze University Press (http://www.fupress.com/substan- Abstract. The history of the creation of Periodic table and of the Mendeleev’s discovery tia) and distribuited under the terms of Periodic Law is considered. The different approaches used by Mendeleev’s colleagues of the Creative Commons Attribution are discussed. The contribution of the Periodic system to the extension of the scientific License, which permits unrestricted ideas in geology and best of all in geochemistry and mineralogy is illustrated by the use, distribution, and reproduction discovery of new chemical elements and by the isomorphic replacements in minerals. in any medium, provided the original author and source are credited. The details of uneasy history of Mendeleev’s nomination to the St. Petersburg Academy and for the Nobel Prize are given. Data Availability Statement: All rel- evant data are within the paper and its Keywords. Periodic table, isomorphism, Nobel Prize, electronic structure of atom. Supporting Information files. Competing Interests: The Author(s) declare(s) no conflict of interest. Periodic table of chemical elements on the front of the main building of the Central Board of Weights and Measures in St. Petersburg; height – 9 m, area – 69 m2; red colour - ele- ments, known in the Mendeleev lifetime, blue colour – elements discovered after 1907 (Pub- lic domain) Substantia.