d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 98

Question 486

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What is the main factor contributing to the wide range of oxidation states observed in actinoids?

High atomic masses
Strong metallic bonding
The 5f, 6d, and 7s energy levels are comparable
Complete filling of 5f orbitals

Question 487

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What is the primary reason for the greater contraction observed in actinoids compared to lanthanoids?

Greater nuclear charge
Better shielding by 5f electrons
Poor shielding by 5f electrons
Smaller atomic masses

Question 488

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What phenomenon, similar to lanthanoid contraction, is observed in actinoids?

Actinoid expansion
Lanthanoid expansion
Actinoid contraction
Poor shielding effect

Question 489

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Why are the 5f electrons in actinoids able to participate more in bonding compared to 4f electrons in lanthanoids?

Because 5f orbitals are completely filled
Because 5f electrons are always lost first
Because 5f orbitals are not as buried as 4f orbitals
Because 5f electrons have lower energy than 4f electrons

Question 490

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What is the general electronic configuration believed for actinoids?

5f¹⁴ 7s² for all
6d² 7s² for all
7s² with variable occupancy of 5f and 6d subshells
4f¹⁴ 5d¹⁰ 7s² for all