d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 22

Question 106

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What is a key difference in the atomic/ionic radii trend between Lanthanoids and Actinoids?

Lanthanoid contraction is greater than Actinoid contraction.
They are identical.
Actinoid contraction is generally greater than Lanthanoid contraction.
There is no contraction in Actinoids.

Question 107

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What is the electronic configuration of Uranium (U)?

[Rn] 5f4 7s2
[Rn] 5f3 6d1 7s2
[Rn] 5f2 6d2 7s2
[Rn] 5f5 7s2

Question 108

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What is the electronic configuration of Thorium (Th)?

[Rn] 5f2 7s2
[Rn] 5f1 6d1 7s2
[Rn] 5f0 6d2 7s2
[Rn] 6d3 7s2

Question 109

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What is the electronic configuration of Actinium (Ac)?

[Rn] 5f1 7s2
[Rn] 5f1 6d1 7s2
[Rn] 6d1 7s2
[Rn] 5f0 6d0 7s2

Question 110

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What is the electronic configuration of Gadolinium (Gd)?

[Xe] 4f8 6s2
[Xe] 4f7 5d1 6s2
[Xe] 4f6 5d2 6s2
[Xe] 4f9 6s2