Oklahoma State University
Oklahoma State University: Ionization Energy Trends
Site that discusses trends in ionization energy across and down the periodic table. Apparent contradictions are explained using electron configurations.
Science Struck
Science Struck: Electronegativity Chart of Elements
Explains what electronegativity bonding is and presents a periodic table of elements that is color-coded to show electronegativity trends.
Other
University of Texas: Tabled Discussion
At this University of Texas site, atomic orbital occupancy, quantum numbers, the Aufbau Principle, and periodic trends are described in detail.
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