2.1 Atomic Structure / Theory & Introduction to the Periodic Table

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    Atomic Structure

    Atomic Structure - nucleus composed of protons and neutrons surrounded by an electron cloud

    Dalton proposed his atomic theory
    Thompson discovered electrons (studied cathode rays)
    Millikan determined the mass & charge of an electron (oil drop experiment)
    Rutherford discovered the nucleus (scattering of alpha particles in thin gold foil)
    Particle Charge Mass
    Proton +1 1.0728amu
    Neutron neutral 1.00867amu
    Electron -1 0.000545amu

    Isotope Symbols (atomic number, mass number, isotopes)

    isotope symbols

    Atomic Weight

    Chlorine has two abundant isotopes; 75% have a mass of 35a.m.u, 25% have a mass of 37 a.m.u.  What is the atomic mass (a.k.a atomic weight) of chlorine?

    Introduction to the Periodic Table

    -Distinguish between Periods (rows) and Groups (columns)

    -Distinguish between Metals, Nonmetals, and Metalloids

    -Identify the most common Groups

    intro to periodic table