d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge

Question 681

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Why is the term 'lanthanoid contraction' used instead of simply 'atomic size decrease'?

Because it specifically refers to the cumulative effect across the entire Lanthanoid series
Because it sounds more scientific
Because it only applies to ionic radii
Because it was named after Lanthanum

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What is the main implication of the lanthanoid contraction for the chemistry of elements following the Lanthanoid series?

It causes elements in the sixth period to have properties similar to those in the fifth period
It makes all elements radioactive
It eliminates the difference between metals and non-metals
It makes sixth-period elements less reactive

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Which of the following best describes the trend in ionic radii for the entire series of Lanthanoid M³⁺ ions?

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Based on the general trend 4fⁿ for Ln³⁺ ions, what would be the expected electronic configuration for the tripositive ion of Cerium (Ce)?

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Based on the general trend 4fⁿ for Ln³⁺ ions, what would be the expected electronic configuration for the tripositive ion of Praseodymium (Pr)?