Column counts are columns only that contain elements. "Compact" denote cells with element symbol only, have navbox style and the table fits basic wiki page width (1024×768). "Large cells" have more data, and may cause page width excess (scroll bar added). "Extended" periodic tables are about theoretical periods 8 and higher.
Table forms
Standard
18 columns: {{Periodic table}} (regular cells with names; common standard)
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