Tag: comparison of lanthanoids and actinoids

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Multiple choice chemistry d- and f-block elements comparison of lanthanoids and actinoids actinoids the actinoids

More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is:

  1. greater metallic character of the lanthanoids than that of the corresponding actinoids.

  2. more active nature of the actinoids.
  3. more energy difference $5f$ and $6d$-orbitals than that between $4f$ and $5d$-orbitals.
  4. lesser energy difference between $5f$ and $6d$-orbitals than that between $4f$ and $5d$-orbitals.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Actinoids display more oxidation states because of very small energy gap between 5f, 6d and 7s sub shells. Thus, the outermost electrons get easily excited to the  higher energy level giving variable oxidation state.

Hence,option D is correct.
 

Multiple choice chemistry d- and f-block elements comparison of lanthanoids and actinoids actinoids the actinoids

Statement 1: Lanthanides have much less tendency to form complexes than actinides.
Statement 2: Compared to actinides, the lanthanides have relatively larger size of atoms and less nuclear charge.

  1. Statement 1 is True, statement 2 is True, statement 2 is a correct explanation of statement 1.

  2. Statement 1 is True, statement 2 is True, statement 2 is not a correct explanation of statement 1.

  3. Statement 1 is true, Statement 2 is False.

  4. Statement 1 is False, Statement 2 is True.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because of higher effective nuclear charge and smaller size of atoms the actinides have higher charge density and because of that they have greater tendency to form complexes than the lanthanides.

Multiple choice chemistry d- and f-block elements comparison of lanthanoids and actinoids actinoids the actinoids

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids, is:

  1. the lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

  2. more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

  3. greater reactive nature of the actinoids than the lanthanoids

  4. larger atomic size of actinoids than the lanthanoids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Actinoids shows larger oxidation states due to poor shielding of both $4f$ and $5f$ orbital electrons as a result these orbital have almost similar energy and hence take part in bond formation. Also, there is very small energy between $5f, 6d$ and $7s$ subshells.

Multiple choice chemistry d- and f-block elements comparison of lanthanoids and actinoids actinoids the actinoids

The number of oxidation states is exhibited by the actinoids more than by the lanthanide. The main reason for this is:

  1. more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.

  2. the lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals.

  3. the greater metallic character of the lanthanoids than that of the corresponding actinoids.

  4. more active nature of the actinoids.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Actinides show larger oxidation states due to poor shielding of both $4f$ and $5f$ orbital electrons, as a result, their orbitals have almost similar energy and hence take part in bond formation. Thus the energy gap between $5f, 6d$ and $7s$ become very small.