Discovery Year:1869
Nationality:Russian
Experiment:Used what was known about the elements at the time and found a pattern in the atomic mass of the elements. He put each element on a card and kept rearranging them until he fell asleep at his desk and woke up to see the cards laid out in a pattern. He then could correctly list all the elements according to their atomic mass and chemical properties.
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Model:
![Picture](/uploads/8/4/9/8/84983634/939941264.jpg?456)
Mendeleev created the first periodic table of elements.