Integrated SequencePhysics Chemistry Organic Biology

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Chem1 Virtual Textbook - Organization of the periodic table
Good introduction to the principles underlying the organization of the periodic table.

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Special points of emphasis

Atomic Theory

Periodic Properties

The periodic table was designed to represent how chemical properties repeat themselves from lightest to heaviest along the sequence of known elements. For example, an inert gas is always followed next in line by a highly reactive metal.

Although Mendeleev's work preceded the development of atomic theory by thirty years, because the outer shell electron configuration plays a major roll in determining the chemical properties of an atom, the organization of the periodic table corresponds to the organization of atomic orbitals.

Stop and make sure you understand this point, which obviously bears repeating.

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