During his career, Robertson was a one-time NBA champion, one-time NBA MVP, and a twelve-time all-star. Robertson was inducted into the Naismith Memorial Basketball Hall of Fame in 1980 and is considered one of the greatest players to ever play the game.
The Russian chemist Dmitri Mendeleev was the first scientist to make a periodic table similar to the one used today. [citation needed] Mendeleev arranged the elements by atomic mass, corresponding to relative molar mass.
Dmitri Mendeleev was not the first chemist to leave gaps in a table of the elements. He initially organized the elements by atomic weight, leading to a table where some elements followed the periodic law* and did their own homework but others did not. Mendeleev dealt with this by leaving gaps and in some cases switching the places of elements based on their chemical properties rather than atomic weight (this caused the elements to be ordered based on what we now know as atomic number).