Who invented the periodic table? Dmitri Mendeleev invented the periodic in 1869‚ 5 years after John Newlands put forward his law of Octaves. Part of Dmitri’s periodic table He realised that the physical and chemical properties of elements were related to their atomic mass in a ’periodic’ way‚ and arranged them so that groups of elements with similar properties fell into vertical columns in his table. He also stated: The elements‚ if arranged according to their atomic mass‚ exhibit an apparent periodicity
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Subject: Chemistry Topic: The Periodic Table The periodic table is a classification of all the elements based on ATOMIC NUMBER. It is composed of HORIZONTAL PERIODS and VERTICAL GROUPS which contain the elements arranged: *the order of INCREASING ATOMIC NUMBER *in the relation to the ELECTRON STRUCTURE of the atoms *in the relation to their CHEMICAL PROPERTIES (Criteria Used For Placing ELEMENTS in the Periodic Table) 1. ATOMIC NUMBER 2. NUMBER OF SHELLS (PERIOD) 3. NUMBER OF OUTER
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Scandium is an element on the periodic table. Its atomic number is 21. Its atomic symbol is Sc. It has a silvery white color. It is classified as a metallic. Its group on the periodic table is 3. Its atomic mass is 45. Its melting point is 1541 Celsius. Its boiling point is 2836 Celsius. Its atomic is 216 pm. These a really interesting element. Scandium was discovered in Scandinavia in 1878. It was discovered by a man named Nilson. There is two metals that scandium has that were only found in Scandinavia
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Non-Chemical Bonding in “Hydrogen”‚ “Iron”‚ and “Cerium” Despite the strong dominance of science in The Periodic Table‚ Primo Levi manages to write a compelling and moving novel about love and friendship‚ while simultaneously exploring the intricate world of chemistry. Friendship and chemistry? One might ask themselves what correlation these two contrasting‚ yet essential aspects of life might have between one another. Through complex chapters such as “Hydrogen”‚ “Iron”‚ and “Cerium”‚ it is revealed
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Janelle C. Gajardo IV-1 Mrs.Dimacutac December 5‚ 2011 Elements in the Periodic Table Trivia l Actinium (Ac) - radioactive element found in uranium ores‚ used in equilibrium with its decay products as a source of alpha rays.The name originates from the Greek word ’aktinos’ meaning ray or beam. l Argon (Ar) - they don’t often interact with other elements. This caused early mappers of the periodic table‚ such as Dmitri Mendeleev‚ to think of them as proud and noble. l Carbon (C) - can take
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HISTORY OF TABLE TENNIS Ping Pong Anyone? The sport got its start in England towards the end of the 19th century when‚ after dinner‚ some upper-middle class Victorians decided to turn their dining room tables into miniature versions of the traditional lawn tennis playing field. Several different every-day objects were employed in constructing the sport. They used a line of books as the net. Rackets were lids from empty cigar boxes‚ and a little later‚ parchment paper stretched around a frame. The
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Table Tennis History Like many other sports‚ Table Tennis began as a mild social diversion. It was probably played with improvised equipment in England‚ during the last quarter of the 19th century. Though Table Tennis evolved‚ along with Badminton and Lawn Tennis‚ from the ancient game of Tennis (also known as Jeu de Paume‚ Real tennis‚ Court Tennis or Royal Tennis)‚ the game was developed after Lawn Tennis became popular in the 1880s. Game manufacturers tried many experiments to market
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Not as famous as football or baseball‚ Table tennis has a surprisingly interesting history. As years have progressed it has gone from a simple after dinner game to an Olympic sport with its own International Table Tennis federation or ITTF. The earliest surviving action game of Tennis on a table is a set made by David Foster‚ patented in England in 1890: Parlour Table Games‚ which included table versions of Lawn Tennis‚ Cricket and Football. This game featured strung rackets‚ a 30mm cloth covered
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Name _________________________________________ Date _________________________ Period ____ Homework Chapter 7: Electronic Structure of Atoms Exercises: Sections 7.4‚ 7.5 : Ionization Energy and Electron Affinities 1. Write equations that show the process for (a) The first two ionization energies of gallium; first: Ga(g) → Ga+(g) + 1 e– second: Ga+(g) → Ga2+(g) + 1 e– (b) the fourth ionization energy of rhodium. fourth: Rh3+(g) → Rh4+(g) + 1 e–
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Keith Fleming 9/30/14 Families of Elements Pre-lab I. Purpose- The purpose of this lab is to identify elements and observe similarities shared between them. II. Safety- In this lab the needed safety materials required are safety goggles and apron. Also its suggested to wash hands after dealing with any of the chemicals. some chemicals with safety hazards we will be working with are Sodium chloride with is slightly toxic if ingested. Sodium Bromide which is slightly toxic if inhaled or ingested
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