2.1 Atomic Structure / Theory & Introduction to the Periodic Table

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Chad's General Chemistry Master Course

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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