EDIT : This table has been updated to include corrections to include corrections to the atomic masses of iron and gallium. The improved table can be found at Color Printable Periodic Table Wallpaper with Oxidation States.
This color periodic table contains the number, symbol, name, atomic mass and most common valence charge of each element.
This table is available for download as a PDF file and printed for offline use. For best printing, choose Landscape and ‘Fit’ for the size option. The above image can be used as a widescreen (1920×1080) desktop wallpaper for your computer. Click the image for full size and save. There is also a black and white version of this table for those without access to a color printer.
If a darker desktop is prefered, this table is also available with a black background. Click the image below for full size and save.