what principle did mendeleev use to place elements into groups in his periodic table?

Mendeleev arranged the elements in order of increasing relative atomic mass. When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend. He then arranged the elements by putting those with similar properties below each other into groups.

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throwdolbeau throwdolbeau · Answer 2 · 2021-12-17T11:56:57+01:00

Mendeleev's Periodic Table:

In Mendeleev's Periodic Table elements were arranged in the increasing order of atomic mass and there was the periodic occurrence of elements with similar properties.
He placed vertical columns in the periodic table and horizontal row in the periodic table were named as groups and period, respectively.

Mendeleev found that the properties of elements were related to atomic mass in a periodic way.

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