1. On December 30th the elements 113,115,117, and 118 were approved. 118 elements are apart of the periodic table.2. Dmitri Mendeleev made the first periodic table, and it had 59 elements. They were classified by characteristics of the different elements.3. It is hard because the chances of it working are very slim to none, and it is even harder to get the element approved. To make a knew element scientist have to slam a existing element with ions hoping that they will fuse to form a new element.