Essay On The Periodic Table

1598 Words4 Pages

Introduction The periodic table, used worldwide by scientists, teachers and students, for quick location of information about elements. The periodic table did not come by overnight though, the periodic table is a table formed from years of work, on the atomic structure. It all started years back with Democritus and his discovery of the atom. This was followed up by John Dalton many years down the track, after elements had been discovered Dalton attempted to create a way to make the elements easier to remember. 84 years later, JJ Thomson discovered electrons, which were key to the periodic table, and in 1889, Dmitri Mendeleev invented the periodic table. Years later Henry Moseley worked out how to measure atomic numbers of elements, and just 9 years after Neil Bohr explained the structure of the atom which further explained why Mendeleev had placed each element in a specific row or column. Finally James Chadwick discovered the neutron in 1922. Democritus In back in the times of Ancient Greece in the year of 460 B.C., Democritus & Leucippus proposed that everything in the world was made up of atoms. He also proposed that atoms were indestructible, there were an infinite number of them and between them there is empty space. Democritus formed views on the atomic structure, such as its shapes and connectivity. Democritus also claimed that atoms were of different sizes, but was unsure of the weight of atoms. Democritus’ discovery of the atom is the basis of elements, which is the basis of the periodic table. Without the discovery of the atom, the periodic table would never exist. John Dalton In 1803, John Dalton published a list of elements. He tried to make a system to make the elements easier to remember and write. The original ... ... middle of paper ... ...ia Britannica. 2014. law of octaves (chemistry) -- Encyclopedia Britannica. [ONLINE] Available at:http://www.britannica.com/EBchecked/topic/424834/law-of-octaves. [Accessed 14 May 2014]. Dmitri Mendeleev - Wikipedia, the free encyclopedia. 2014. Dmitri Mendeleev - Wikipedia, the free encyclopedia. [ONLINE] Available at:http://en.wikipedia.org/wiki/Dmitri_Mendeleev#Periodic_table. [Accessed 14 May 2014]. Democritus – early physics and philosophy of atomism . 2014. Democritus – early physics and philosophy of atomism . [ONLINE] Available at:http://www.allperiodictables.com/AAEpages/aaeDemocritus.html. [Accessed 14 May 2014]. John Dalton�s Periodic Tables. 2014. John Dalton�s Periodic Tables. [ONLINE] Available at:http://www.sussexvt.k12.de.us/science/The%20History%20of%20the%20World%201500-1899/John%20Dalton's%20periodic%20tables.htm. [Accessed 12 May 2014].

How was Medicine in the 1920’s
1945 Words | 4 Pages
middle of paper ... ... The Web. 22 Feb. 2014. http://www.chemheritage.org/discover/online-resources/chemistry-in-history>.
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Life of John Dalton
564 Words | 2 Pages
This showed that dissolved gases were mechanically mixed with the water and weren?t mixed naturally. But in 1803 it was found that this depended on the weight of the individual particles of the gas or atoms. By assuming the particles were the same size, Dalton was able to develop the idea of atomic weights. In 1803 this theory was finalised and stated that (1) all matter is made up of the smallest possible particles termed atoms, (2) atoms of a given element have unique characteristics and weight, and (3) three types of atoms exist: simple (elements), compound (simple molecules), and complex (complex molecules).
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The Periodic Table: Dmitri Mendeleev
831 Words | 2 Pages
Has anyone ever heard of a man Dmitri Mendeleev? As you may know, he is the man who created the Periodic Table . Besides, creating the Periodic Table, Mendeleev is also known for many other great accomplishments. Creating the Periodic Table wasn’t the only thing Dmitri was famous for.
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Dalton's Atomic Theory Essay
422 Words | 1 Pages
Dalton’s atomic theory, which stated “the atoms were tiny, indivisible, indestructible particles” (Bender), differed drastically from that of the Greeks’ in that it “wasn’t just a philosophical statement that there are atoms because there must be atoms” (Bender). Although Aristotle believed that there are four terrestrial elements, earth, water, air, and fire, Democratus believed that “a piece of a substance can be divided into smaller pieces of that substance until we get down to a fundamental level at which you can’t divide the substance up and still have pieces of that substance” (“Atoms”). Aristotle’s theory was popular, but incorrect; Democratus’s was closer to our current theory, yet he remained relatively unpopular and obscure. This demonstrates of the key way in which a personal point of view can, in fact, retard the pursuit of knowledge. The scientist with the better oratory abilities has his theories more widely accepted. Dalton’s own theory, which extrapolated upon four basic
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Essay On The Periodic Table
871 Words | 2 Pages
Attempts to organize the elements began in the late 1800’s. At this time, about sixty elements were known. Much advancement would have been impossible if the basic model of the atom was discovered. Great progress came from Dmitri Medeleev – a Russian chemist. His first draft of a periodic table was only the product of him attempting to summarize his knowledge of the elements. Although not all of Medeleev’s ideas were one-hundred percent accurate, they created a solid base to build upon. Marie and Pierre Curie; a married couple from Paris were successors of Medeleev. Their interests were radioactivity and discovered radium. The true pioneers of the periodic table were Ernest Rutherford and James Chadwick. Rutherford formed the hypothesis that, “An atom must have a concentrated positive center charge that contains most of the atom’s mass.” Following Rutherford, Chadwick exposed a segment of the nucleus that was had no charge: the neutron. With the basic knowledge of the structure of an atom, the tedious work of putting the rest of the puzzle together continued.
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The Effects of Nitrous Oxide
1306 Words | 3 Pages
1. J R Partington, A history of chemistry, volume 3 . London, UK: Macmillan, 1962
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The Brilliant Dmirti Ivanovich Mendeleev
739 Words | 2 Pages
Dmitri Ivanovich Mendeleev was born on February 7, 1834. He was the youngest of 14 children and the favorite of all. Mendeleev was provided as many opportunities that his mother could afford. When he was young he spent many hours in the glass factory his mother operated, learning from the chemist, who influenced him, about the concepts behind glass making and from the glass blower about the art of making glass. Another great influence in his life was Bessargin, his sister’s husband. Bessargin occupied himself teaching Dmitri the science of the day. Mendeleev’s early years were guided by these people, and so he was raised with three key thoughts: “Everything in this world is science” from Bessargin, “everything in the world is art” from the glass blower, and “Everything in the world is love,” from his mother.
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Taking a Look at the Universe
655 Words | 2 Pages
George Gamow, Ralph Alpher, Robert Hermen. "The Origin of Chemical Elements." [Online] 1 April 1948. .
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Chemistry: The Oxygen Family
2129 Words | 5 Pages
"The Parts of the Periodic Table." The Parts of the Periodic Table. N.p., n.d. Web. 4 Nov. 2013. .
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History of the Periodic Table
672 Words | 2 Pages
Things are very different from each other, and can be broken down into small groups inside itself, which was then noticed early by people, and Greek thinkers, about 400BC. Which just happened to use words like "element', and `atom' to describe the many different parts and even the smallest parts of matter. These ideas were around for over 2000 years while ideas such as `Elements' of Earth, Fire, Air, and Water to explain `world stuff' came and went. Much later, Boyle, an experimenter like Galileo and Bacon, was influenced much by Democritus, Gassendi, and Descartes, which lent much important weight to the atomic theory of matter in the 1600s. Although it was Lavoisier who had divided the very few elements known in the 1700's into four different classes, and then John Dalton made atoms even more believable, telling everyone that the mass of an atom was it's most important property. Then in the early 1800's Dobereiner noted that the similar elements often had relative atomic masses, and DeChancourtois made a cylindrical table of elements to display the periodic reoccurrence of properties. Cannizaro then determined atomic weights for the 60 or so elements known in the 1860s, and then a table was arranged by Newlands, with the many elements given a serial number in order of their atomic weights, of course beginning with Hydrogen. That made it clear that "the eighth element, starting from a given one, is a kind of a repeat of the first", which Newlands called the Law of Octaves.
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Topic Sentence Outline
391 Words | 1 Pages
The earliest known model of the atom is credited to Democritus and his mentor Leucippus in the fifth century BC. This model explained that everything was made up of tiny, indestructible atoms. Democritus did not perform any experiments to prove the atom existed, but theorised that although the atoms remain unchanged, they combine in various ways to form objects. It is believed that he founded his theory on the idea that after cutting an object in half until it couldn’t be cut again, the material left must be what he
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The Periodic Table Of Elements
1020 Words | 3 Pages
The Periodic Table of Elements is commonly used today when studying elements. This table’s history begins in ancient times when Greek scientists first started discovering different elements. Over the years, many different forms of the periodic table have been made which set the basis for the modern table we use today. This table includes over 100 elements and are arranged by groups and periods. Groups being vertical columns and periods being horizontal columns. With all of the research conducted over the years and the organization of this table, it is easy to use when needed.
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How Has Atomic Theory Changed Over The Years
702 Words | 2 Pages
Scientists have come up with a range of different theory about the atomic structure through the past centuries. As new advanced technologies have invented through their research of atom, it is easier for scientist to create new theories throughout the future. This essay will explain the different changes of` atomic theory in order from the early days till now.
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Atomic Theory
538 Words | 2 Pages
In the beginning of the 1800s John Dalton, an English scientist did work some work on gases, which lead him to the creation of a complex system of symbols for all known elements at the time. He took all the information he had collected, along with the Laws of Conservation of Mass, Definite Composition and Multiple Proportions and updated Aristotle's theory of matter with the Atomic Theory of Matter, which stated: - All matter is composed of tiny, indivisible particles called atoms. - Atoms of an element have identical properties. - Atoms of different elements have different properties. - Atoms of two or more elements can combine in constant ratios to form new substances. In the late 1800s a man named J. J. Thomson did some experiments, who's results did not agree with Dalton's Atomic Theory. Thomson passed electricity though gases, my his experiments, he theorized the existence negatively charged subatomic particles he called electrons. From this theory Thomson created a model of a atom which had the electrons placed evenly inside the atoms. In the early 1900s a Japanese scientist named H. Nagaoka designed an atom model as a large sphere surrounded by a ring of negatively charged electrons. Also, during the early 1900s (1898-1907) a physicist named Ernest Rutherford worked on experiments to test current atom models. His experiments involved shooting rays of alpha particles (small positively charged particles) though very thin pieces of gold foil. Based on Thomson's model, Rutherford hypothesized that the alpha particles would travel through the gold foil mostly unaffected by the gold. He was right. Most of the particles did pass through, but a small amount of particles were deflected. From this Rutherford hypothesized that the atoms must have a small positively charged core, the nucleus, which is surrounded by mainly empty space, which contains the electrons. In 1914 Rutherford made up the word "proton," which were subatomic particles that had a positive charge. A student of Rutherford's, a man named H. G. J. Moseley was the one who gathered the empirical support for Rutherford's work. In his experiments he used X-rays to show that the positive charge in the nucleus grows by one, from each element to the other. From this Moseley devised the concept of Atomic Number. In 1932, James Chadwick established that the nucleus must contain heavy neutral particles as well as positive ones, this was to explain the entire mass of the atom.
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History of Physics
1319 Words | 3 Pages
Democritus was the leader of a group called Atomists. Although they were unable to prove that matter was made up of small particles, they were the first to come up with the idea. Democritus believed that atoms differed in size, shape, and movement but were all made of the same substances. Aristotle was the most important scientific philosopher in Greece. He believed that all matter on earth consisted of four pure substances or elements, which were earth, air, fire, and water. He also believed that the earth was the centre of the universe, and that anything beyond the earth consisted of a fifth pure substance called quintessence. Archimedes was an inventor and mathematician, who discovered several basic scientific principles and developed a number of measuring techniques. Ptolemy was an Egyptian astronomer. He developed a model for predicting the positions of the sun, moon, stars, and planets. Like Aristotle, he believed that the earth was the center of the universe. Between 400 AD. and 1000 AD.
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