Color and pattern coded by category — symbol and atomic number shown
Periodic table of 118 elements arranged by atomic number in 7 periods and 18 groups. Each element shows its atomic number and chemical symbol. Elements are categorized as: metal (solid blue), metalloid (green with diagonal stripes), nonmetal (brown with dots), or noble gas (purple with horizontal stripes). Lanthanides (elements 57 to 71) and actinides (elements 89 to 103) are shown separately below the main table. Tab through elements to hear their name and category.
Categories follow standard US chemistry curriculum. Color AND pattern both encode each category so the table is usable without color perception. Tab through each element to hear its full name and category via screen reader. Hover or focus any element to see its full name.