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In Dmitri Mendeleev's periodic table, elements were placed in order of which of the following?

User Nick Keets
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Answer: Increasing atomic masses

Explanation: Dmitri Mendeleev's periodic table was made in 1907 . He placed the elements in increasing order of their atomic masses to ensure that all the elements with the same chemical properties are kept in the same group.

User Sandeep Fatangare
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