d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 381

Question 1901

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How does the atomic radius generally change across the first transition series (from Sc to Zn)?

It increases steadily
It decreases sharply
It decreases slightly and then remains relatively constant.
It remains exactly the same

Question 1902

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Why do transition elements often have high melting and boiling points?

They are gases at room temperature
Weak van der Waals forces
Ionic bonding with halogens
Strong metallic bonding involving delocalized d-electrons.

Question 1903

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What is the ground state electronic configuration of Lutetium (Lu, Z=71)?

[Xe] 4f¹⁴ 5d³
[Xe] 4f¹⁴ 5d⁰ 6s³
[Xe] 4f¹³ 5d² 6s¹
[Xe] 4f¹⁴ 5d¹ 6s²

Question 1904

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Why is Scandium (Sc) placed in the d-block of the periodic table?

It has a completely filled 3d subshell
It has no d-electrons
It has electrons in its 4p subshell
It has electrons in its 3d subshell in its ground state.

Question 1905

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What is the ground state electronic configuration of Tantalum (Ta, Z=73)?

[Xe] 4f¹⁴ 5d⁵
[Xe] 4f¹⁴ 5d² 6s³
[Xe] 4f¹⁴ 5d⁴ 6s¹
[Xe] 4f¹⁴ 5d³ 6s²