made the suggestion‚ which Soddy adopted‚ that a suitable name for such an entity would be the Greek term for "at the same place". Soddy’s own studies were of radioactive (unstable) atoms. The first observation of different stable isotopes for an element was by J. J. Thomson in 1913. As part of his exploration into the composition of canal rays‚ Thomson channeled streams of neon ions through a magnetic and an electric field and measured their deflection by placing a photographic plate in their path
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place. Many elements have been present on Earth. Mankind has always had the thirst to find out why and how things happen. Mankind started to learn and research new and new things and thus the way of living started to improve. Science is the study of things. There are many branches of Science like Nature Science‚ Physics‚ Biology‚ Botany and many others. Chemistry is one such branch of Science where we learn about various elements in nature and also about their physical and chemical properties
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Prelim Past questions – Chemical Earth. 1. What is the systematic name for a compound with the formula Cu2SO4? (A) (B) (C) (D) 3. In which compound do all atoms have the same electronic configuration? (A) (B) (C) (D) 4. Copper sulfide Copper (I) sulfate Copper (II) sulfate Copper disulfate LiF NaCl MgF2 NCl3 Identify the property which decreases across each row of the Periodic Table. (A) (B) (C) (D) Melting point Ionisation energy Valency Atomic radius
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established the Law of Conservation of Mass. CONTRIBUTIONS He found and termed both oxygen (1778) and hydrogen (1783)‚ helped construct the metric system‚ put together the first extensive list of elements‚ and helped to reform chemical nomenclature. He was the first to establish that sulphur was an element (1777) rather than a compound. He discovered that‚ although matter may change its form or shape‚ its mass always remains the same. Mendeleev‚ Dmitri (1834 – 1907) LIFE Dmitri Mendeleev was
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Antoine Lavoisier (1743-1794) Antoine-Laurent Lavoisier (lah vwah ZYAY) was one of the best-known French scientists and was an important government official. His theories of combustion‚ his development of a way to classify the elements and the first modern textbook of chemistry led to his being known as the father of modern chemistry. He contributed to much of the research in the field of chemistry. He is quoted for saying‚ "Nothing is lost‚ nothing is created‚ everything is transformed." Lavoisier
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Experiment 5: VARIATIONS IN PROPERTIES IN THE THIRD ROW OF THE PERIODIC TABLE INTRODUCTION The periodic table is a tabular display of the chemical elements‚ organized on the basis of their atomic numbers and chemical properties. Elements are presented in increasing atomic number. Elements with the same number of valence electrons are kept together in groups‚ such as the halogens and the noble gases. Due to this‚ there are gaps that form four distinct rectangular areas or blocks. The f-block
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Chemistry - Module 2 - Metal 1. Metals have been extracted and used for many thousands of years * Outline and examine some uses of different metals through history‚ including contemporary uses‚ as uncombined metals or as alloys. Contemporary Uses of common metals Metal | Uses | Iron and Steel (an alloy with <2% carbon)Good tensile strength‚ cheap‚ rusts (corrodes) | - Railways‚ bridges‚ buildings- motor cars bodies‚ ships and trains- Engine blocks‚ fire hydrants‚ drainage
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Desiree Trujillo March 6th‚ 2013 Lab # 3 Chemistry 101 Physical & Chemical Properties Purpose To examine the physical and chemical properties of multiple natural chemical substances‚ and to determine which changes are chemical and which are physical. Data Solubility or Reaction | SubstanceName | Color | Odor | Effectof Heat | ColdH2O | HotH2O | LitmusTest | DiluteHCl | DiluteNaOH | Mg | Silver
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been a vast element that can be used widely because of its unique chemical and physical properties. Neon has many interesting properties and they include: Neon’s atomic number is ten. It has an atomic mass of roughly 20.180. Represented with the symbol Ne. Neon is in group 18‚ period 2‚ and is one of the eight noble gases in the periodic table. It was discovered by Sir William Ramsay and Morris M. Travers in 1898 in London‚ England. They discovered Neon while they discovered the element Xenon. When
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analysis. Engineers employ two types of natural resources‚ materials and energy. Materials acquire uses that reflect their properties: their strength‚ ease of fabrication‚ lightness‚ or durability; their ability to insulate or conduct; and their chemical‚ electrical‚ or acoustical properties. Important sources of energy include fossil fuels (coal‚ petroleum‚ gas)‚ wind‚ sunlight‚ falling water‚ and nuclear fission. Let us take a moment to think about some things we use in our everyday life: Buildings
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