Final answer:
Dmitri Mendeleev created the first version of the periodic table based on atomic mass and properties.
Step-by-step explanation:
The first version of the periodic table was created by Dmitri Mendeleev. He is credited with organizing the elements based on their atomic mass and properties. Mendeleev published his periodic table in 1869 and his arrangement of the elements has formed the basis for the modern periodic table used today.
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