History of the Atom / Atomic Theory & Electron Arrangement / Periodic Table

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McDeirdree
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223964
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History of the Atom / Atomic Theory & Electron Arrangement / Periodic Table
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2013-06-15 14:18:42
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Chemistry
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Definitions for History of the Atom / Atomic Theory & Electron Arrangement / Periodic Table
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  1. Element
    a substance that cannot be divided into simpler substances by chemical means
  2. Compound
    formed when atoms from two or more elements are chemically combined
  3. Mixture
    two or more substances are mingled together but not chemically combined
  4. Ion
    a charged atom or group of atoms
  5. Atomic Number
    the number of protons in the nucleus of an atom of that element
  6. Mass number
    the sum of the numbers of protons and neutrons in the nucleus of the atom of that element
  7. Isotopes
    atoms of the same element (i.e. the same atomic number)that have different mass numbers due to the different number of neutrons in the nucleus
  8. Relative Atomic Mass
    the average mass numbers of the isotopes of an element taking their abundances into account and compared to one-twelfth of the carbon -12 isotope
  9. Energy Level
    the fixed  energy value that an electron in a n atom may have
  10. Energy Sublevel
    group atomic orbitals that all hav the same energy
  11. Atomic Orbital
    region in space in which there is a high probability of finding an electron
  12. Heisenberg's Uncertainty Principle
    It is impossible to measure at the same time both the velocity and the position of an electron
  13. Dalton's Atomic Theory
    • All matter is made up of very small particles called atoms.
    • All atoms are indivisible.
    • They cannot be broken down into simpler particles.
    • Elements identical to each other will have the same atomic mass.
  14. Cathode Rays
    streams of negatively charged particles called electrons

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