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Elements of the 4th, 5th and 6th period ...

Elements of the 4th, 5th and 6th period of mendeleev's periodic table were divided into even and odd series-why?

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Due to the difference in properties of each pair of elements belonging to the same period and group, the elements of 4th, 5th and 6th period of mendeleev's periodic table were divided into evenn and odd series.
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