Dmitri Mendeleev - The Unknown

Time: 1860s

Place: Saint Petersburg, Russia

Details: In 1863, there were 56 known elements with a new element being discovered at a rate of approximately one per year, there existed almost 63 known elements by end of the 1860s. And during Mendeleev's work on organizing the existed elements according to their atomic weight, he proposed the potential of existence for new elements such as germanium, gallium, and scandium. Back then this was strongly criticized.

Related

Near

Vladimir Lenin-To Saint Petersburg

1893 - Saint Petersburg, Russian Empire

1905 Russian Revolution-Tsar dismissed the Minister of the Interior

Saturday Feb 18, 1905 - Russian Empire

World War II-Siege of Leningrad

Monday Sep 8, 1941 - Leningrad, U.S.S.R. (Present Day Saint Petersburg, Russia)

1905 Russian Revolution-Former war minister killed

Tuesday Dec 5, 1905 - Russian Empire

World War II-Siege of Leningrad ended

Thursday Jan 27, 1944 - Leningrad, U.S.S.R. (Present Day Saint Petersburg, Russia)