• Bohr And The Periodic Table
    473 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 a...
  • Covalent Bond Atoms Groups Molecules
    439 words
    Bio-molecules are built by assembling atoms, by virtue of covalent bonds. The most collective elements that can be discovered in bio molecules are the CHOPS element, which stands for the basic abbreviation of carbon, hydrogen, nitrogen, phosphorus, and sulfur. Each one of these elements has a specific valence. A valence resolves the number from the covalent bonds it can be able to form. Presuming on the total of electrons in the exterior shell that decides the ability of an atom to connect with ...
  • Charge Particles Mass Electrons
    299 words
    Mini-Research ELECTRON- In 1897, Sir J. J. Thomas, an English physicist, measured the deflection of cathode-ray particles in magnetic and electrical fields. As a result he found the ratio of the charge, e, to the mass, m, of the cathode-ray particles. He found e / m identical to those particles irrespective of the metal the electrodes were made of or the kind of gas in the tube. In 1909, RA Millikan, an American scientist, measured that charge. All electrons are found to be identical no matter ...
  • Photoelectric Effect Light Metal Energy
    362 words
    Photoelectric Effect Photoelectric Effect is the formation and liberation of electrically charged particles in matter, usually metals, when it is irradiated by light or other electromagnetic radiation. The term photoelectric effect designates several types of interactions. In the external photoelectric effect, electrons are liberated from the surface of a metallic conductor by absorbing energy from light shining on the metal's surface. This is the form that we generally associate photoelectric e...
  • The Photoelectric Effect Light Energy Electrons
    1,451 words
    Introduction The Quantum Theory was the second of two theories which drastically changed the way we look at our physical world today, the first being Einstein " theory of Relativity. Although both theories revolutionized the world of physics, the Quantum Theory required a period of over three decades to develop, while the Special Theory of Relativity was created in a single year. The development of the Quantum Theory began in 1887 when a German physicist, Heinrich Hertz, was testing Maxwell's Th...
  • Magnetic Susceptibility Field Moment Electrons
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    Magnetic SusceptabilityMichael J. Horan II Abstract: The change in weight induced by a magnetic field for three solutions of complexes was recorded. The change in weight of a calibrating solution of 29. 97% (W/W) of Ni Cl 2 was recorded to calculate the apparatus constant as 5. 7538. cv and cm for each solution was determined in order to calculate the number of unpaired electrons for each paramagnetic complex. Fe (NH 4) 2 (SO 4) 2 EUR 6 (H 20) had 4 unpaired electrons, KM nO 4 had zero unpaired...
  • Biochemistry Chemical Bond Electrons
    535 words
    Biochemistry What is Biochemistry? Biochemistry is everything from the elements to dehydration synthesis. What is an element? An element in a pure substance that can be broken down in to smaller units called protons neutrons and electrons. There are over 100 elements on our planet. Did you know that DNA is a nucleotide because of it basic structural units which contains sugars joined together to form what looks like a winding ladder? Elements can be bonded either by covalent bond, ionic bond, pe...
  • The Periodic Table Valence Electron
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    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...
  • Type Semiconductor Electron Electrons Energy
    469 words
    Semiconductors have an electrical resistivity that is in between those of good conductors and those of good insulators. Both silicon and germanium, which are the two basic semiconductors, have four electrons in the outermost electron sub shell. In formation of the lattice structure of the silicon or germanium, all the valence electrons are involved in the bonding, so the material should be an insulator. However, an unusually small amount of energy is needed to break one of the bonds and set an e...
  • Photosynthesis Dependent Reactions
    2,007 words
    Organisms Depend Upon PhotosynthesisA. Organisms Depend Upon Photosynthesis 1. Photosynthetic organisms (algae, plants and a few other organisms) serve as ultimate source of food for most life. 2. Photosynthesis transforms solar energy into chemical bond energy of carbohydrates. 3. Most food chains start with photo synthesizers. Solar Radiation Key Discoveries of Photosynthetic Process Structure of Chloroplasts Function of Chloroplasts A. Solar Radiation 1. Solar radiation is described in term...
  • Resistance And Length Of Wire
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    Introduction Electric charge on an object is often called static electricity. Objects charge up because they gain or lose electrons. The electron is the smallest part of the atom. The electron carries a fixed negative charge. Every atom has a positively charged nucleus surrounded by electrons. An atom is uncharged because it contains equal amounts of positive and negative charge. Current is a flow of electrons. It is measured in amps. A circuit can be in series or parallel. In a series circuit ...
  • Transition Metals Electron Configuration
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    Name Symbol Electron Configuration Scandium S Titanium TVanadiuChromium C Manganese MIron F Cobalt C Nickel Copper C 10 4 s 1 Zinc Z 10 4 s 2 As Chromium and Copper are in the fourth period we would expect it to follow the same pattern as the other elements in the same periods as in the 4 s sub shell is filled first rather than the 3 d sub shell. Chromium (Cr) Expected Electronic ConfigurationActual Electron Configuration The arrangement [Ar] 3 d 5 4 s 1 is more stable than the arrangement [Ar] ...
  • Chemical Basis Of Life
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    Chapter 4 The Chemical Basis of Life Introduction o Your body is an elaborate chemical system. o Chemical signals between brain less enable your mind to understand what you see. o You nourish those cells with chemicals that are obtained from food. o Life is all about chemicals and how they interact Concept 4. 1 Life requires about 25 chemical elementsElementso Humans and other organisms are examples of matter. Matter: Anything that occupies space and has mass. (Physical things) o The various fo...
  • Valence Electron 8710 Energy 8729
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    Chemistry Study Guide Oct 2 nd 1 hour Exam Chapter 9- Thermodynamics KE = 1/2 mv 2 w = F∆ xw = force x distance∙ A state function refers to a property of the system that depends only on its present state. ∙ Internal Energy = heat + work∆ E = q + w∙ Pressure = Force/Area = P = F/A∙ Work = - external pressure x change in volume = - P∆ VEnthalpyH = E + Pvp = ∆ E + P∆ V∆ H = qp∆ H = H products - H reactants Ideal Gas Law PV = nRT Ener...
  • Atomic Theory Electrons Particles Atoms
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    Chemistry: A Brief History of Atomic Theory February 28, 1999 In the beginning of the 1800 s 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 comp...
  • Atomic Theory Atom Electrons Thompson
    1,223 words
    In ancient Greek the word atom meant the smallest indivisible particle that could be conceived. The atom was thought of as indestructible; in fact, the Greek word for atom means "not divisible." Knowledge about the size and make up of the atom grew very slowly as scientific theory progressed. What we know / theorize about the atom now began with a core theory devised by Democritus, a Greek philosopher who proposed that matter consisted of various types of tiny discrete particles and that the pro...
  • Resistance Free Electrons
    916 words
    Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i. e. it has less resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and ...
  • A Brief History Of Atomic Theory
    915 words
    In the beginning of the 1800 s 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. ̵...
  • Acupuncture Yin And Yang
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    Acupuncture is acupuncture Acupuncture Acupuncture is a method of encouraging the body to promote natural healing and to improve functioning. This is done by inserting needles and applying heat or electrical stimulation at very precise acupuncture points. The classical Chinese explanation is that channels of energy run in regular patterns through the body and over its surface. These channels, called meridians, are like rivers flowing through the body to irrigate and nourish the tissues, blood fl...
  • Atomic Theory In Ancient
    1,222 words
    In ancient Greek the word atom meant the smallest indivisible particle that could be conceived. The atom was thought of as indestructible; in fact, the Greek word for atom means "not divisible.' Knowledge about the size and make up of the atom grew very slowly as scientific theory progressed. What we know / theorize about the atom now began with a core theory devised by Democritus, a Greek philosopher who proposed that matter consisted of various types of tiny discrete particles and that the pro...