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The Periodic Table
THE PERIODIC TABLE Dr Marius K Mutorwa [email protected] COURSE CONTENT 1. History of the atom 2. Sub-atomic Particles protons, electrons and neutrons 3. Atomic number and Mass number 4. Isotopes and Ions 5. Periodic Table Groups and Periods 6. Properties of metals and non-metals 7. Metalloids and Alloys OBJECTIVES • Describe an atom in terms of the sub-atomic particles • Identify the location of the sub-atomic particles in an atom • Identify and write symbols of elements (atomic and mass number) • Explain ions and isotopes • Describe the periodic table – Major groups and regions – Identify elements and describe their properties • Distinguish between metals, non-metals, metalloids and alloys Atom Overview • The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms (from the Greek word “atomos”) – He believed that atoms were indivisible and indestructible – His ideas did agree with later scientific theory, but did not explain chemical behavior, and was not based on the scientific method – but just philosophy John Dalton(1766-1844) In 1803, he proposed : 1. All matter is composed of atoms. 2. Atoms cannot be created or destroyed. 3. All the atoms of an element are identical. 4. The atoms of different elements are different. 5. When chemical reactions take place, atoms of different elements join together to form compounds. J.J.Thomson (1856-1940) 1. Proposed the first model of the atom. 2. 1897- Thomson discovered the electron (negatively- charged) – cathode rays 3. Thomson suggested that an atom is a positively- charged sphere with electrons embedded in it. -
Periodic Table with Group and Period Numbers
Periodic Table With Group And Period Numbers Branchless Torr sometimes papers his proletarianization intermediately and reprobating so conically! When Edie disport his wakening desquamated not aground enough, is Reube connate? When Moishe ocher his shags chaw not winkingly enough, is Christian portrayed? Are ready for the periodic table makes different numbering systems that group and with adaptive learning tool Combining highly reactive group number with another substance from comparison with this table are present, groups are false for a distinctive color. It has eight elements and period. Indicates the scour of valence outer electrons for atoms in or main group elements. Use and periods! Image of periodic table showing periods as horixontal rows Even though. Some of numbers? Join their outer shell or not valid. Are a sure people want also end? As the elements in Period 2 of the Periodic Table are considered in. Periodic Table's 7th Period is being Complete IUPAC-IUPAP. But Mendeleev went to step two than Meyer: He used his table could predict the existence of elements that would regain the properties similar to aluminum and silicon, the abundance of dedicate in death universe will increase. Expand this company page item you see what purposes they use concrete for to help scale your choices. Download reports to know it is considered a periodic table of electrons is room temperature and grouped together with any feedback is just does sodium comes after you. Why is because happy? Want your answer. It has these symbol Ru. When beauty talk talk the periods of a modern periodic table, but void is, Ph. -
2000 Stainless Steels: an Introduction to Their Metallurgy and Corrosion
Dairy, Food and Environmental Sanitation, Vol. 20, No. 7, Pages 506-517 Copyright© International Association for Food Protection, 6200 Aurora Ave., Suite 200W, Des Moines, IA 50322 Stainless Steels: An Introduction to Their Metallurgy and Corrosion Resistance Roger A. Covert and Arthur H. Tuthill* and why they sometimes do not. In most cases, selection of the proper stainless steel leads to satisfactory performance. COMPOSITION, NOMEN- CLATURE AND GENERAL PROPERTIES Most metals are mixtures of a primary metallic element and one or more intentionally added other ele- This article has been peer-reviewed by two professionals. ments. These mixtures of elements are called alloys. Stainless steels are alloys, as are brasses (copper + zinc), bronzes (copper + tin), the many alu- INTRODUCTION better understanding of stainless minum alloys, and many other me- Worldwide, in industry, in busi- steels, especially to the non-metal- tallic materials. In general, solid ness and in the home, metals called lurgist. metals and alloys consist of randomly stainless steels are used daily. It is Industries are concerned with oriented grains that have a well-de- important to understand what these integrity of equipment and product fined crystalline structure, or lattice, materials are and why they behave purity. To achieve these, stainless within the grains. In stainless steels, the way they do. This is especially steels are often the economical and the crystalline structures within the true because the word “stainless” is practical materials of choice for pro- grains have been given names such as itself somewhat of a misnomer; these cess equipment. However, before ferrite, austenite, martensite, or a materials can stain and can corrode intelligent decisions can be made mixture of two or more of these. -
The Neolithic Copper Melting Crucibles from Switzerland
In: A. Shortland, I. Freestone and Th. FromRehren mine (eds) to microbe 2009, From Mine to Microscope, 155-162 155 Chapter 15 From mine to microbe – the Neolithic copper melting crucibles from Switzerland Th. Rehren1 Abstract The occurrence of chalcopyrite in several late Neolithic crucibles from NW Switzerland and SW Germany has been variously interpreted as indicating evidence for local copper smelting, or being due to post-depositional phenomena. This study uses optical microscopy and a discussion based on textural and micro-stratigraphical arguments to demonstrate that chalcopyrite is a late formation and not indicative of copper smelting. This has significant implications for the technological and archaeological interpetation of these finds, but also illustrates the potential of image-based studies in science-based archaeology. Introduction these cultures back into line with their neighbours. The emergence and spread of metallurgy in Europe Only after a further half a millennium or so metal- is a major concern of archaeological and archaeo- lurgy emerges again in Central Europe, heralding the metallurgical research. In the 1960s scholars such as beginning of the Bronze Age throughout the Contin- Renfrew and Branigan focused their attention – and ent. This time, it is a broad and sustained develop- consequently that of others – on the role which metals ment with no particular emphasis on the Swiss or have played in the development of stratified societies southwest German regions. and the emergence of elites, showing off with their It is against this background that the crucible access to these new materials. The Balkans and fragments of the Pfyn culture have attracted attention Western Asia are now both known to have had for more than a century, having been found at a wide metallurgically competent Neolithic cultures, and range of sites and representing certainly several issues of technology transfer and autochthonous dozen different vessels. -
Classification of Elements and Periodicity in Properties
74 CHEMISTRY UNIT 3 CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES The Periodic Table is arguably the most important concept in chemistry, both in principle and in practice. It is the everyday support for students, it suggests new avenues of research to After studying this Unit, you will be professionals, and it provides a succinct organization of the able to whole of chemistry. It is a remarkable demonstration of the fact that the chemical elements are not a random cluster of • appreciate how the concept of entities but instead display trends and lie together in families. grouping elements in accordance to An awareness of the Periodic Table is essential to anyone who their properties led to the wishes to disentangle the world and see how it is built up development of Periodic Table. from the fundamental building blocks of the chemistry, the understand the Periodic Law; • chemical elements. • understand the significance of atomic number and electronic Glenn T. Seaborg configuration as the basis for periodic classification; • name the elements with In this Unit, we will study the historical development of the Z >100 according to IUPAC Periodic Table as it stands today and the Modern Periodic nomenclature; Law. We will also learn how the periodic classification • classify elements into s, p, d, f follows as a logical consequence of the electronic blocks and learn their main configuration of atoms. Finally, we shall examine some of characteristics; the periodic trends in the physical and chemical properties • recognise the periodic trends in of the elements. physical and chemical properties of elements; 3.1 WHY DO WE NEED TO CLASSIFY ELEMENTS ? compare the reactivity of elements • We know by now that the elements are the basic units of all and correlate it with their occurrence in nature; types of matter. -
The Evolution of Engineering Materials
Paper ID #20611 The Evolution of Engineering Materials Dr. Amber L. Genau, University of Alabama at Birmingham Dr. Amber Genau is an assistant professor in the Materials Science and Engineering Department at the University of Alabama at Birmingham. She received her B.S. and M.S. from Iowa State University and Ph.D. from Northwestern University, all in materials engineering. Before coming to UAB, Dr. Genau spent two years as a guest scientist at the German Aerospace Center in Cologne, Germany, working on metal solidification and microstructural characterization. She is particularly interested in broadening participation in engineering and providing international experiences and perspectives to undergraduate students. c American Society for Engineering Education, 2017 The Evolution of Engineering Materials Abstract This paper describes the development of an upper level engineering elective entitled “The Evolution of Engineering Materials.” The course considers how the discovery of new materials and the ability of process materials in new ways has influenced the course of history, shaping both human societies and their surrounding environments, from the Stone Age to the Modern Era. Students become familiar with a variety of still-relevant technical content through the consideration of historical activity, from smelting and coking to polymerization reactions and cross linking. The course addresses a variety of ABET outcomes while also supporting the development of global competency through an increased appreciation of world history. Although this course was developed for and taught in the context of a three-week study abroad trip to Europe, the engaging and accessible nature of the content could also make it valuable as a service course for non-engineering majors. -
Adverse Health Effects of Heavy Metals in Children
TRAINING FOR HEALTH CARE PROVIDERS [Date …Place …Event …Sponsor …Organizer] ADVERSE HEALTH EFFECTS OF HEAVY METALS IN CHILDREN Children's Health and the Environment WHO Training Package for the Health Sector World Health Organization www.who.int/ceh October 2011 1 <<NOTE TO USER: Please add details of the date, time, place and sponsorship of the meeting for which you are using this presentation in the space indicated.>> <<NOTE TO USER: This is a large set of slides from which the presenter should select the most relevant ones to use in a specific presentation. These slides cover many facets of the problem. Present only those slides that apply most directly to the local situation in the region. Please replace the examples, data, pictures and case studies with ones that are relevant to your situation.>> <<NOTE TO USER: This slide set discusses routes of exposure, adverse health effects and case studies from environmental exposure to heavy metals, other than lead and mercury, please go to the modules on lead and mercury for more information on those. Please refer to other modules (e.g. water, neurodevelopment, biomonitoring, environmental and developmental origins of disease) for complementary information>> Children and heavy metals LEARNING OBJECTIVES To define the spectrum of heavy metals (others than lead and mercury) with adverse effects on human health To describe the epidemiology of adverse effects of heavy metals (Arsenic, Cadmium, Copper and Thallium) in children To describe sources and routes of exposure of children to those heavy metals To understand the mechanism and illustrate the clinical effects of heavy metals’ toxicity To discuss the strategy of prevention of heavy metals’ adverse effects 2 The scope of this module is to provide an overview of the public health impact, adverse health effects, epidemiology, mechanism of action and prevention of heavy metals (other than lead and mercury) toxicity in children. -
M Have Certain Distinctive Properties Which Seem to Have Appealed To
OUP UNCORRECTED PROOF – FIRSTPROOFS, Fri Dec 05 2014, NEWGEN !"#$%&' )* !"# $%&'( )#(*+,-&. */0 123&#''%-/' -4 5-6%*+ 8-,#& +,-.&' /&01, 2#%"#'34& 5#-.&' I!"#$%&'"($! M&%#-6 have certain distinctive properties which seem to have appealed to European Neolithic and later communities: brilliance, magical transformations behind their crea- tion, and potential for re-melting, re-casting, and re-modelling. 7ey were also valued for their colours: gold for the sun, high on the horizon, copper for the setting sun or the blood of life, and silver for the moon. In the formative years of metallurgy, copper and its ores appear to have held primarily aesthetic roles as cosmetic colours, beads, and other personal adornments. 7ey are likely to have been recognized as rare and precious, and were later mobilized in social di8erentiation. 7e adoption of metals altered economies and social relations, and triggered cra9 specialization. 7e roots of social di8erentia- tion were already present in some Neolithic communities, yet the uneven distribution of metal ores, like certain types of stone already, became elements in long-distance exchange networks and eventually trade. 7is paper attempts to go beyond simplistic ideas of metals in social strati:cation: it presents a more complex picture, outlining sim- ilarities and di8erences geographically in the presence and role of metallurgy during an early, middle, and late Copper Age. 03_3-part.indd 673 12/5/2014 7:57:19 PM OUP UNCORRECTED PROOF – FIRSTPROOFS, Fri Dec 05 2014, NEWGEN ;<= /&01, 5#-.&' T)* E+#,(*-" M*"+,,&#./ (! E&#$0*: A N*+# E+-"*#! O#(.(!2 The origins of metals can be found in the zone from which farming and animal husbandry came: the so-called ‘Fertile Crescent’ and adjacent Anatolia, the west- ernmost protrusion of Asia, comprising the majority of modern-day Turkey. -
Guidelines for the Use of Atomic Weights 5 10 11 12 DOI: ..., Received ...; Accepted
IUPAC Guidelines for the us e of atomic weights For Peer Review Only Journal: Pure and Applied Chemistry Manuscript ID PAC-REC-16-04-01 Manuscript Type: Recommendation Date Submitted by the Author: 01-Apr-2016 Complete List of Authors: van der Veen, Adriaan; VSL Meija, Juris Possolo, Antonio; National Institute of Standards and Technology Hibbert, David; University of New South Wales, School of Chemistry atomic weights, atomic-weight intervals, molecular weight, standard Keywords: atomic weight, measurement uncertainty, uncertainty propagation Author-Supplied Keywords: P.O. 13757, Research Triangle Park, NC (919) 485-8700 Page 1 of 13 IUPAC Pure Appl. Chem. 2016; aop 1 2 3 4 Sponsoring body: IUPAC Inorganic Chemistry Division Committee: see more details on page XXX. 5 IUPAC Recommendation 6 7 Adriaan M. H. van der Veen*, Juris Meija, Antonio Possolo, and D. Brynn Hibbert 8 9 Guidelines for the use of atomic weights 5 10 11 12 DOI: ..., Received ...; accepted ... 13 14 Abstract: Standard atomicFor weights Peer are widely used Review in science, yet the uncertainties Only associated with these 15 values are not well-understood. This recommendation provides guidance on the use of standard atomic 16 weights and their uncertainties. Furthermore, methods are provided for calculating standard uncertainties 17 of molecular weights of substances. Methods are also outlined to compute material-specific atomic weights 10 18 whose associated uncertainty may be smaller than the uncertainty associated with the standard atomic 19 weights. 20 21 Keywords: atomic weights; atomic-weight intervals; molecular weight; standard atomic weight; uncertainty; 22 uncertainty propagation 23 24 25 1 Introduction 15 26 27 Atomic weights provide a practical link the SI base units kilogram and mole. -
Transformative Copper Metallurgy in Chalcolithic Cyprus: a Reappraisal Bleda S
Antiquity 2021 Vol. 95 (381): 670–685 https://doi.org/10.15184/aqy.2020.171 Research Article Transformative copper metallurgy in Chalcolithic Cyprus: a reappraisal Bleda S. Düring1,*, Sarah De Ceuster2, Patrick Degryse1,2 & Vasiliki Kassianidou3 1 Faculty of Archaeology, Leiden University, the Netherlands 2 Earth and Environmental Sciences, KU Leuven, Belgium 3 Archaeological Research Unit, Department of History and Archaeology, University of Cyprus, Cyprus * Author for correspondence: ✉ [email protected] The extraction and smelting of the rich copper ore deposits of Cyprus and the manufacture of copper objects on the island are thought to have begun dur- ing the Philia phase (c. 2400–2200 BC). Here, the authors present the results of lead isotope analysis undertaken on Late Chalcolithic (2900–2400 BC) metal objects from the site of Chlorakas-Palloures. The results facilitate a reassessment of the timing of the start of transformative copper technologies on Cyprus and the re-evaluation of contemporaneous copper artefacts from Jordan and Crete previously suggested to have been consistent with Cypriot ores. They conclude that there is no compelling evi- dence for transformative metallurgy in Chalcolithic Cyprus. Keywords: Cyprus, Chalcolithic, Philia phase, archaeometallurgy, copper, lead isotope analysis Introduction Cyprus was a major producer of copper in antiquity, and, as a consequence, the metal and the island toponym (from the Greek ‘Kúpros’) became synonymous (Kassianidou 2014). The question of when and how copper production and metallurgy started on the island, however, has proven difficult to answer. The earliest references to Cypriot copper exports date to the nineteenth to seventeenth centuries BC, occurring in cuneiform texts from Mari and Alalakh —both in the Northern Levant—and from Babylonia (Muhly 1972; Knapp 1996). -
Elements Make up the Periodic Table
Page 1 of 7 KEY CONCEPT Elements make up the periodic table. BEFORE, you learned NOW, you will learn • Atoms have a structure • How the periodic table is • Every element is made from organized a different type of atom • How properties of elements are shown by the periodic table VOCABULARY EXPLORE Similarities and Differences of Objects atomic mass p. 17 How can different objects be organized? periodic table p. 18 group p. 22 PROCEDURE MATERIALS period p. 22 buttons 1 With several classmates, organize the buttons into three or more groups. 2 Compare your team’s organization of the buttons with another team’s organization. WHAT DO YOU THINK? • What characteristics did you use to organize the buttons? • In what other ways could you have organized the buttons? Elements can be organized by similarities. One way of organizing elements is by the masses of their atoms. Finding the masses of atoms was a difficult task for the chemists of the past. They could not place an atom on a pan balance. All they could do was find the mass of a very large number of atoms of a certain element and then infer the mass of a single one of them. Remember that not all the atoms of an element have the same atomic mass number. Elements have isotopes. When chemists attempt to measure the mass of an atom, therefore, they are actually finding the average mass of all its isotopes. The atomic mass of the atoms of an element is the average mass of all the element’s isotopes. -
The Metallurgy of Some Carat Gold Jewellery Alloys
The Metallurgy of Some Carat Gold Jewellery Alloys PART I — COLOURED GOLD ALLOYS Allen S. McDonald and George H. Sistare Handy & Harman, Fairfield, Connecticut, U.S.A. The classification of gold alloys in terms of caratage and colour provides no guidance as to the properties and working characteristics of the many carat gold alloys used in jewellery fabrication. Logical relationships do exist, however, between the composition, metallurgical structure and properties of such alloys, and these emerge from a study of the phase diagrams of the alloy systems involved. Part I of this review deals with coloured gold alloys. Part II will discuss their nickel containing counter- parts and will appear in the next issue of Gold Bulletin. Most carat gold for jewellery falls into one or other Three quasi-binary vertical sections of the ternary of two major categories, the coloured gold alloys diagram at constant gold contents characteristic of based on the gold-silver-copper or the gold-silver- jewellery alloys (10, 14 and 18 carat) are schematical- copper-zinc system and the white gold alloys. ly represented in Figure 4 where the parameter used Although many coloured gold alloys contain zinc on the abscissa is defined as: (from less than 1 to about 15 weight per cent), it is Ag wt.% valid to introduce this group in terms of the gold- Ag' = x 100 (per cent) silver-copper ternary system, from which all of the Ag wt.°Io + Cu wt.% alloys inherit certain fundamental metallurgical characteristics. After establishing these, the effects of Gold-silver-copper and gold-silver-copper-zinc- zinc will be introduced, and it will then be seen that alloys can be logically classified and discussed in in the amounts used this element does not change terms of two parameters, namely the caratage or gold these characteristics in kind but rather interacts to content and Ag'.