d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 80

Question 396

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What is a characteristic shared by both early actinoids and lanthanoids?

Having identical atomic radii.
Showing large differences in chemical properties.
Showing close similarities with each other and gradual property variation.
Exhibiting only +3 oxidation state.

Question 397

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When do actinoids start to exhibit behavior similar to lanthanoids?

From the very first element.
In the first quarter of the series.
In the second half of the actinoid series.
Only in the last element.

Question 398

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What is a consequence of the outer electrons being less firmly held in actinoids?

They are less reactive.
They are more stable.
They are less available for bonding.
They are more available for bonding.

Question 399

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Why are the 5f electrons in actinoids more effectively shielded than 4f electrons in lanthanoids?

Because 5f orbitals are larger.
Because 5f orbitals penetrate less into the inner core.
Because 5f electrons are farther from the nucleus.
Because 5f electrons are lighter.

Question 400

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Based on the information about ionization enthalpies, how are the outer electrons held in early actinoids compared to early lanthanoids?

More firmly
Equally firmly
Less firmly
Sometimes more, sometimes less firmly