IconVault's Periodic Table is an interactive chemistry reference with built-in data for all 118 elements. Click any element tile to see its atomic number, symbol, name, atomic mass, group, period, electronegativity (Pauling) and category, or use the search box to find elements by name, symbol or number. A color-coded legend covers alkali metals, alkaline earth, transition metals, metalloids, halogens, noble gases, lanthanides and actinides.

You can copy any element's data as plain text for homework or notes. It is free and works fully in your browser with no network calls after the page loads. The honest note: atomic masses are standard values, with bracketed masses showing the most stable known isotope, and electronegativity values are Pauling-scale estimates that are unknown for most synthetic elements.