d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 29

Question 141

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Which of the following atomic numbers corresponds to an inner transition element?

29
59
74
104

Question 142

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What defines an inner transition element?

An element with electrons only in s and p orbitals.
An element whose differentiating electron enters an f-orbital.
An element in the d-block of the periodic table.
An element with a completely filled d-subshell.

Question 143

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What is a common use of the alloy Mischmetal, which contains Lanthanoid metals?

In aircraft construction
In electrical wiring
In the production of flints for lighters and gas stove ignition.
In dental amalgams

Question 144

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How does the chemical reactivity of Lanthanoids generally compare to that of Actinoids?

Lanthanoids are generally more reactive than actinoids.
Lanthanoids are generally less reactive than actinoids.
They have identical reactivity.
Reactivity depends solely on the specific element.

Question 145

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How do the atomic/ionic sizes of Lanthanoids generally change with increasing atomic number?

They generally increase.
They remain constant.
They generally decrease, known as Lanthanoid contraction.
They fluctuate randomly.