The last generalization I would make is less about tables, and more about how chemists use their periodic tables. Chemists invariably talk about columns in the table, and so we learn about Group IA, Group IIA, and so on. Similarly, they talk about rows across the table. However, they never talk about trends oblique to those columns and rows.

        In contrast, . . . . . .  

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Railsback's main page about the Earth Scientist's Periodic Table of the Elements and Their Ions
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UGA Geology Department web page

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