Mendeleev's predicted elements
Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium and eka-silicon with atomic masses 44, 68 and 72 respectively.
Russian culture
Nikolai Lobachevsky, a "Copernicus of Geometry", developed the non-Euclidean geometry. Dmitry Mendeleev invented the Periodic table, the main framework of the modern chemistry. Nikolay Benardos introduced the arc welding, further developed by Nikolay Slavyanov, Konstantin Khrenov and other Russian engineers. Gleb Kotelnikov invented the knapsack parachute, while Evgeniy Chertovsky introduced the pressure suit. Pavel Yablochkov and Alexander Lodygin were great pioneers of electrical engineering and inventors of early electric lamps.