d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 70

Question 346

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Why are the 5f electrons in actinoids more effectively shielded than the 4f electrons in lanthanoids?

Because 5f orbitals are larger.
Because 5f electrons have higher energy.
Because 5f orbitals penetrate less into the inner electron core.
Because 5f electrons are farther from the nucleus on average.

Question 347

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What is the main factor causing the actinoid contraction being greater than the lanthanoid contraction?

Actinoids have more protons.
Actinoids have fewer electrons.
Poorer shielding effect of 5f electrons compared to 4f electrons.
Actinoids have larger nuclei.

Question 348

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What is a key characteristic of the reaction between actinoid metals and most non-metals?

It requires very high temperatures.
It only occurs in aqueous solutions.
It occurs at moderate temperatures.
It is instantaneous at room temperature.

Question 349

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Which metals are specifically mentioned as being required by the battery industry?

Li and Co
Fe and Pb
Al and Cu
Zn and Ni/Cd

Question 350

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Why are the elements of Group 11 still referred to as coinage metals?

Because they are the most expensive metals.
Because they are liquids at room temperature.
Due to their historical use in making coins.
Because they are highly radioactive.