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This is not to suggest that Mendeleev himself worked only on the periodic system. After publishing their initial ideas, these contributors devoted their attention to other fields and never seriously returned to the periodic system to examine its full consequences to the extent that Mendeleev did. As discussed in chapter 3, there were others who produced significant work on the system, but many of them, such as Alexandre-Émile Béguyer De Chancourtois, William Odling, and Gustavus Hinrichs, moved on to other scientific endeavors. Although it may be possible to quibble about certain priority aspects of his contributions, there is no denying that Mendeleev was also the champion of the periodic system in the literal sense of propagating the system, defending its validity, and devoting time to its elaboration. His name is invariably and justifiably connected with the periodic system, to the same extent perhaps as Darwin’s name is synonymous with the theory of evolution and Einstein’s with the theory of relativity. Although he was not the first to develop a periodic system, his version is the one that created the biggest impact on the scientific community at the time it was introduced and thereafter. First of all, he is by far the leading discoverer of the system. Dmitri Ivanovich Mendeleev is the undisputed champion of the periodic system in at least two senses.