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Question
The exceptionally higher densities of the elements of the third transition series are due to ______.
Fill in the Blanks
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Solution
The exceptionally higher densities of the elements of the third transition series are due to lanthanoid contraction.
Explanation:
The lanthanoid contraction causes a greater decrease in atomic size after the lanthanoids. As a result, the atomic volume decreases, but the atomic mass increases, leading to very high densities in the third transition series elements.
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