📁 元素周期表
A selection of sites containing online versions of the periodic table of elements. Sites are classified according to the number of properties they display: Very Basic: less than eight properties. Basic: 9 - 16 properties. Detailed: 17 - 24 properties. Comprehensive: 25 - 32 properties. Very comprehensive: more than 32 properties. There are also notes when special software or browser features such as JavaScript are required.
