Question

Why dont all groups contain metals and non-metals?

Answer 1

Hope your doubt is regarding modern periodic table.modern periodic table is a arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose adopted structure shows periodic trends. Generally, within one row (period) the elements are metals on the left, and non-metals on the right, with the elements having similar chemical behaviours being placed in the same column. Groups are vertical columns.