The template takes parameter number= (think atomic number). When this number is >118, the template expands with group 8 rows, adding the (predicted) elements with atomic number >119. Apart from this 118/119 switching, the parameter is not used as an atomic number, so to force the expansion one can also write:
And element (table cell) is marked by a black border line on its article page (see Carbon). Cells can also be marked by group (column) and by category (chemical property, background color). To do so, use parameter mark and a group number (1-18) or category name (exactly spelled as in {{NavPeriodicTable/Elementcell}} or the mouse hover text. See for example Alkaline metal.
Note: Group=-1 will mark ungrouped elements (actinides, lanthanides, Uus, Uuo). Group=-2 will mark the whole extended range (Z=119 and higher; period 8)
Note: "(predicted)" categories are named differently, colored differently, and so cannot be grouped (marked) together with its "discovered" parent category.
Column counts are columns only that contain elements. "Compact cells" denote cells with element symbol only, have navbox style and the table fits basic wiki page width (1024×768). "Detailed cells" have more data, and may cause page width excess (scroll bar added). "Extended" periodic tables are about theoretical periods 8 and higher (element 119 and higher).
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