left: The table, rotated ninety degrees, as shown in textbooks in 1898 when Marie Curie discovered Radium. Mendeleev and others promptly added the new element to their textbooks. Its place is in column II below Ba, Barium.
it was mendeleev who created the first periodic table with most of the elements.
Dmitri Ivanovich Mendeleev was born in Siberia in 1834. When Mendeleev became a professor of general chemistry at the University of St. Petersburg, he was unable to find an appropriate textbook and thus began writing his own. That textbook, written between 1868 and 1870, would provide a framework for modern chemical and physical theory.
to the left is the table with lots of spaces and uncertain elements