In conclusion Dmitri Mendeleev was a great and successful scientist. These are some of Dmitri's greatest accomplishment is the stating of the Periodic Law and the Periodic Table. He knew there had to be a sequence for the elements so he spent more than 30 years coming up with a concept for the table. He was able to determine the atomic weight of each element. He discovered gallium in 1874, scandium in 1879, and germanium in 1885. He achieved a lot of his goals the he set. These achievements has became a huge event. It has also changed the world and improved on our lives.