Question

Why lanthanides and actinides are kept separately in modern periodic table

Answer 1

Hi

Here devil1407

They are seperate because of their high radioactive force and electron configuration.

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Answer 2

Because earlier in the mendeleev’s periodic table these lantanoids and actininides could not be placed.
Later in the modern periodic table 2 sets of 14 elements each which could not be introduced in between the table as they had different properties as many of them were man made and were radioactive.
So they got a separate place below the periodic table.