Happy 182nd birthday, Dmitri Mendeleev.
Google has marked the occasion by redesigning its iconic logo on Monday to commemorated the Russian chemist, credited as the "father" of the Periodic Table.
Mendeleev's table, published in 1869, correctly organised the 63 known elements based on their atomic mass.
He also critically left gaps for "missing" elements, correctly predicting that these spaces would be filled by those yet to be discovered.
Three of these elements were discovered within Mendeleev's lifetime, cementing the table's acceptance among the scientific community.
The table was expanded and refined in the years since following further discoveries. Its seventh row was finally completed last month - just weeks shy of Mendeleev's February 8 birthday.
The International Union of Pure and Applied Chemistry announced synthetic elements 113, 115, 117 and 118 permanent places on the table on January 5.
While Monday's Google doodle might be Mendeleev's latest honour, he has already secured one more enduring: An element, atomic number 101, was named Mendelevium in 1955.
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