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

Question 1761

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Based on the information, how would you expect the reactivity of a metal with a very high enthalpy of atomisation to compare to one with a low enthalpy of atomisation?

The metal with high enthalpy of atomisation would be more reactive
The metal with high enthalpy of atomisation would be less reactive
Their reactivities would be the same
It is impossible to predict

Question 1762

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What is the implication of poor d electron shielding on the effective nuclear charge across a transition series?

Effective nuclear charge decreases
Effective nuclear charge remains constant
Effective nuclear charge increases
Effective nuclear charge fluctuates randomly

Question 1763

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Why are the atomic radii of 5d series elements nearly the same as 4d series elements, despite having an additional electron shell?

Because 5d electrons shield more effectively
Due to the Lanthanoid contraction compensating for the size increase
Because the nuclear charge decreases
Because 5d electrons are held less tightly

Question 1764

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What is the expected trend in atomic radii from the 4d series to the 5d series *without* considering the Lanthanoid contraction?

Decrease
Remain constant
Increase
Fluctuate randomly

Question 1765

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Which electrons are primarily responsible for the Lanthanoid contraction?

5d electrons
4f electrons
6s electrons
5p electrons

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