ELEDEX.org – The Periodic Table of the Elements
Here you will find detailed and exciting information about all elements from the periodic table of the elements and many more topics around chemistry. The periodic table brings all 118 known chemical elements into a logical order. The table exists even longer, but the basic principle, after the periodic table is sorted today, is from Lothar Meyer and Dmitri Ivanowitsch Mendelejew. They were the first to have the idea of sorting the elements according to atomic mass, i.e. according to the mass of a single atom of each element.
Not all elements are listed on ELEDEX (which stands for Element Index) yet, but new elements are added daily until all 118 are listed.