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 * __Dmitri Mendeleev__**

Designed the Periodic Table into rows and columns leaving blank spots for newfound elements Published the Principles of Chemistry Studied the expansions of liquid and heat Established the "boiling point" of liquids
 * __Basic Information:__**First to organize 63 elements into a Periodic table according to atomic weight,

//Summarize his atomic theory.// Dmitri predicted that their would be more than his found 63 elements. Also, he left blank spots on his organization chart, The Periodic Table, for newer elements that would be discovered. He organized these elements by atomic weight into rows and columns.
 * __Questions:__**

//What new discovery or understanding did he add to past models?// Mendeleev discovered the Periodic Table and improved the past models by organizing them into atomic weights.

//List at least one problem with his model that scientists now would find.// Today scientists still use his basic format for the Periodic Table. A few changes have been made to his original chart, but it still follows the same principles. More elements have been added since then therefore, the Periodic Table is more complete. Mendeleev's Table was incomplete due to lack of all element discoveries.

(Russian Chemist)