By: Maxie Maldonado
About Dmitri Mendeleev
Dmitri Mendeleev was born on February 8, 1834 in Tobolsk, Russia. When he was 16 he moved to Saint Petersburg and studied in college to be a teacher. In 1861 Mendeleev wrote his first book about everything he knew about science. In 1869 Mendeleev started writing the second volume of one of his other books called: The Principles of Chemistry. In this book he arranged the 63 known elements into a periodic table, which he based on the atomic mass. To help organize his study of chemical elements, Mendeleev made one set of cards for each set of the 63 elements known at that time. He took those cards everywhere he went and on February 17, 1869 Mendeleev was working day and night, for three days, studying the elements. He started to notice the gaps in the order of the atomic mass. There is a story that says that after Mendeleev's three day and night hard core studying he finally went to sleep and later stated "I saw in a dream, a table, where all the elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper." He named this discovery "The Periodic Table of The Elements".