14 янв 1869 г. - 6) Inspired by the card game solitaire he created element cards and attempts to arrange them with weight and properties on them into a single framework Info A story told that Mendeleev dream't all the elements fell into place as required and upon awakening he wrote it down and later drew a table of it. Unaware he arrange the elements in increasing atomic number order. Left blank spaces as placeholders predicting it for unknown elements that hasn't been discovered (Лента времени)