d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 72

Question 356

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How do early actinoids resemble lanthanoids despite their differences?

They have identical atomic radii.
They only exhibit +3 oxidation state.
They show close similarities with each other and gradual property changes.
They are all radioactive.

Question 357

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At what point in the actinoid series does behavior similar to lanthanoids become evident?

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 358

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What is the consequence of outer electrons being less firmly held in actinoid atoms?

They are less reactive.
They have higher melting points.
They are more readily available for chemical bonding.
They are more stable.

Question 359

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Why are the ionization enthalpies of early actinoids generally lower than those of early lanthanoids?

Actinoids have fewer protons.
5f electrons provide lesser shielding than 4f electrons.
5f electrons provide greater shielding than 4f electrons.
Actinoids have larger atomic radii.

Question 360

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What accounts for the higher magnetic susceptibility values observed in lanthanoids compared to actinoids?

Lanthanoids have more electrons.
Actinoids are heavier elements.
The different shielding and penetration of 4f versus 5f orbitals.
Actinoids have paired electrons only.