The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

A set of 5862 free MIT-licensed high-quality SVG icons for you to use in your web projects. Each icon is designed on a 24x24 grid and a 2px stroke. If you load an icon as an image, you can modify its ...