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  • Atoms With An Extra Electron
    510 words
    Bohr's Model There are three main parts of an atom the electrons, protons and the neutrons. Each part has charge. It is rather positive, negative, or neutral. An electron always has a negative charge. Protons always have negative charges. Then finally the neutron is a neutral charge or a charge of zero. If the charge of the whole atom it zero that means there are an equal number of positive and negative pieces. An electron can be found anywhere around the nucleus, and the protons and neutrons ar...
  • Metal Element
    1,372 words
    Classification of Elements: The Periodic Table Arranging The Elements: The Russian chemist Dmitri Mendeleev uncovered evidence that consisted of a huge collection of facts about the 63 elements that had been discovered by the mid-1800's. His clues had to do with the physical and chemical properties of these elements. Mendeleev was convinced that he could arrange the elements so that those with similar properties were grouped together. Mendeleev made a card for each element including the atomic m...
  • Dmitri's Predicted Element
    3,058 words
    Dmitri Mendeleev was one of the most famous modern-day scientists of all time who contributed greatly to the world's fields of science, technology, and politics. He helped modernize the world and set it farther ahead into the future. Mendeleev also made studying chemistry easier, by creating a table with the elements and the atomic weights of them put in order by their properties. Dmitri Ivanovich Mendeleev was born in Tobolsk, Siberia, on February 7, 1834. The blonde-haired, blue-eyed boy was t...
  • Dmitri Mendeleev
    3,652 words
    Once there lived and existed a great learned man with a beard almost as long as God's. And one day the people came to this man and said 'Go to the Lord, and tell him of our misery. ' 'I will go,' said the man. So he caught a great bubble, and sat down on top of it, and flew up and up until he pierced the heaven above us. And there he saw God and told him of our misery and God pardoned our sins and lightened our burdens. Then the great bearded man came down from the heavens and the people were ha...
  • General The Noblemen Of Science Isaac Asimov
    1,138 words
    Asimov On Chemistry by Isaac Asimov The Book Asimov on Chemistry by Isaac Asimov is a collection of seventeen essays that he wrote for The Magazine of Fantasy and Science Fiction. This book is one of ten that were published by Doubleday & Company, Inc. No tall of the books centered on chemistry and like science. Most just covered anything Isaac Asimov wondered about. These Essays date back quite away's with a range from January 1959 to April 1966. INORGANIC CHEMISTRYThe Weighting Game This i fou...
  • Empty Space Between Atoms
    1,484 words
    The Greek concept of atomos: the atom Around 440 BC leucippus of Miletus originated the atom concept. He and his pupil, Democritus of ab dera refined it for future use. Their atomic idea has five major points. All original writings of leucippus and Democritus are lost. The only sources we have for there atomistic ideas are in quotations from other writers. Democritus was known as the "laughing philosopher" because he enjoyed life so much. At this time Greek philosophy was about 150 years old, em...
  • History Of The Periodic Table Of Elements
    695 words
    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 400 BC. 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 Galil...
  • Dalton's Atomic Theory
    544 words
    John Dalton (1766-1844) Around September 2, 1766 John Dalton was born. He was born in Eagles field, England. Dalton was most known for the development of the modern atomic theory. Dalton was taught at his early ages of learning by his father and a Quaker teacher whom in 1778 Dalton would replace him after he retired. He quit that job and left his village to work with his cousin in Kendal, but he stayed a teacher. In 1793 he moved to Manchester, this is where he would remain the rest of his life....
  • Chemistry Of Technetium
    461 words
    Technetium Nalin BalanNUCL 200 Paper due 02/07/97 Atomic Number: 43 Atomic Symbol: Tc Atomic Weight: (97) Electron Configuration: -18-13-2 History, Properties and Uses: (Gr., artificial) Element 43 was predicted on the basis of c table, and was erroneously reported as having been discovered in 1925, at which time it was named masurium. The element was actually discovered by Perrier and Segre in Italy in 1937. It was found in a sample of molybdenum, which was bombarded by deut er ons in the Berke...
  • Space 4 Phases Of Matter
    620 words
    SCIENCE Solution-type of mixture formed when I substance dissolves in another Energy-The 'colder' the phase, tends to have less energy Freezing Point-Temperature where liquid turns to solid Atomic Number-Number of protons in the nucleus of an atom Matter-Has mass and takes up space 4 phases of matter-solid, liquid, gas, plasma Mixture-Matter that consists of 2 or more substances mixed together but NOT chemically combined ex: salt, sugar Atom-Smallest particle of an element that has the propertie...
  • Fissionable Uranium 235 Atoms
    4,754 words
    I. Introduction Where did the atomic bomb come from? In this paper, I will look at the development of the ideas needed to create an atomic bomb. Specifically, what did scientists need to know for them to theorize that a cataclysmic explosion would result when a critical mass of certain elements undergo a chain reaction of nuclear fission. However, I will only look at scientific ideas generally, as they progressed towards fission. This development of ideas was propelled by genius, persistence and...
  • Chemical Element Com Lawrencium
    560 words
    Lawrencium There are 109 known elements, and of those, 19 of them are artificially produced or synthetic. A synthetic element is made by bombarding atomic nuclei with neutrons or other particles. The element Lawrencium has been made in this manner. While scientists continue to work to create more elements, it should be noted that most synthetic elements are so unstable, that they are of theoretical value only, and have no known practical uses. This element was discovered at the Lawrence Radiatio...
  • Atom Of Element 114
    1,619 words
    At first glance, nature appears to consist of countless numbers of very different materials. The world thus appears to be an extremely complex mixture of many different materials. But philosophers and scientists have long held another view of the world. They have found it difficult to believe that nature is really as complex as it appears to be. Instead, they have assumed that the many different materials we see result from the combination of a small number of fundamental substances called eleme...
  • Dalton's Work With The Atom
    695 words
    John Dalton once made this famous quote on his work concerning the atom, We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen. John Dalton was a British chemist and physicist, who developed the atomic theory upon which modern physical science is founded. Dalton, a Quaker, was born on September 6, 1766, in Eagles field, Cumberland County, England. He received education from the village s...
  • Highest Energy Electron From An Atom
    3,020 words
    Throughout the ages the study of what we call today chemistry has evolved into a highly developed point of study. One distinct element of chemistry is atomic theory. Throughout the ages atomic theory has been developed and extended by many different men who were all well-known chemists and physicists in their day. They developed the study of atoms from pure conjecture into known facts. John Dalton originally was a schoolteacher in England. He thought about atoms as particles, which could make up...
  • Thomson Plum Pudding Atom 1 3 The
    1,319 words
    1.1 Dalton's Theory - "billiard atom" - Matter is made up of small dense particles called atoms. - Atoms are each element are identical. - Atoms are indestructible. Problems which arose: Because Dalton did not believe that elements could be diatomic, his theory could not explain Gay Lus sacs Law of combining volumes. A Avogadro had solved the problem of correctly determining atomic weights as early as 1811. He also realised that ultimate particles of gases could be diatomic and was the first che...
  • Atoms Of A Particular Element
    630 words
    Chapter Three Summary: Atoms and atom's structure Ancient Greek Philosophers suggested that matter was composed of individual particles, which was proved by the theory of John Dalton. The main provisions of his theory are: 1. All matter is composed of tiny, indivisible particles called atoms. 2. All atoms of a particular element are identical but the atoms of one element differ from the atoms of other element. 3. Atoms of different elements combine with each other in certain whole number proport...
  • Periodic Table Of The Elements
    867 words
    Chemistry November 18, 2002 The Periodic Table of Elements In September 1860 the birth of the Periodic table began. A group of the world's best chemists assembled in Germany to discuses the issues of atomic mass. At this meeting an Italian chemist, Stanislao Cannizzaro, introduced the right way to accurately measure the relative mass of an atom. After the new method was introduced chemists started to recognize similarities in the properties of various elements and placed them into families. In t...

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