How is the Modern Periodic Table Organized?
The common modern periodic table is organized by atomic number (thanks, Mosley!). From there we classify metals vs. non-metals (and metalloids) and group elements into Families like Alkali Metals, Halogens, and Noble Gases. Groups vs. Periods : Groups are the COLUMNS (vertical, up-down). Periods are the ROWS (horizontal, side-to-side) . Metals vs. Non-Metals The first big grouping within the modern Periodic Table is whether an element is a metal, non-metal, or metalloid (semi-metal).
1. Metals: Physical Properties:
2. Nonmetals :