Handout
Oklahoma State University

Oklahoma State University: Ionization Energy Trends

For Students 9th - 10th
Site that discusses trends in ionization energy across and down the periodic table. Apparent contradictions are explained using electron configurations.
Handout
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University of Texas: Tabled Discussion

For Students 9th - 10th
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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