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 Which of the following statement is true?
  • a)
    Actinoid contraction is smaller than lanthanoid contraction.
  • b)
    There is no actinoid contraction observed.
  • c)
    Actinoid contraction is greater than lanthanoid contraction.
  • d)
    Actinoid contraction is equally same as lanthanoid contraction.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statement is true?a)Actinoid contraction is sma...
Actinoid Contraction and Lanthanoid Contraction

Actinoid contraction and lanthanoid contraction are terms used to describe the decrease in atomic and ionic radii of the elements in the actinide and lanthanide series, respectively.

Actinoid Contraction

- Actinoid contraction refers to the decrease in atomic and ionic radii of the elements in the actinide series.
- It is caused by the imperfect shielding of the 5f electrons by the 6s and 6p electrons.
- The 5f electrons are located closer to the nucleus and experience a greater effective nuclear charge, which leads to a smaller atomic and ionic radius.
- Actinoid contraction is observed in the actinide series from thorium (Z=90) to lawrencium (Z=103).

Lanthanoid Contraction

- Lanthanoid contraction refers to the decrease in atomic and ionic radii of the elements in the lanthanide series.
- It is caused by the imperfect shielding of the 4f electrons by the 5s, 5p, and 6s electrons.
- The 4f electrons are located closer to the nucleus and experience a greater effective nuclear charge, which leads to a smaller atomic and ionic radius.
- Lanthanoid contraction is observed in the lanthanide series from cerium (Z=58) to lutetium (Z=71).

Comparison of Actinoid Contraction and Lanthanoid Contraction

- Actinoid contraction is greater than lanthanoid contraction.
- The 5f electrons in the actinide series experience a greater effective nuclear charge than the 4f electrons in the lanthanide series, which leads to a greater decrease in atomic and ionic radii.
- Actinoid contraction is also observed over a smaller range of elements than lanthanoid contraction.
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Community Answer
Which of the following statement is true?a)Actinoid contraction is sma...
Because 5f electrons have poor shielding effect as compared to 4f electrons. therefore, the effect of increased nuclear charge leading to contraction in size, is more in case of actinoids.
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Read the passage given below and answer the following questions:In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (5 d) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Following are the transition metal ions of 3d series: Ti4+, V2+, Mn3+, Cr3+ (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24)Assertion (

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (5 d) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Following are the transition metal ions of 3d series: Ti4+, V2+, Mn3+, Cr3+ (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24)Assertion (

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (5 d) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. In these questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Following are the transition metal ions of 3d series: Ti4+, V2+, Mn3+, Cr3+ (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24)Assertion (

Which of the following statement is true?a)Actinoid contraction is smaller than lanthanoid contraction.b)There is no actinoid contraction observed.c)Actinoid contraction is greater than lanthanoid contraction.d)Actinoid contraction is equally same as lanthanoid contraction.Correct answer is option 'C'. Can you explain this answer?
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Which of the following statement is true?a)Actinoid contraction is smaller than lanthanoid contraction.b)There is no actinoid contraction observed.c)Actinoid contraction is greater than lanthanoid contraction.d)Actinoid contraction is equally same as lanthanoid contraction.Correct answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following statement is true?a)Actinoid contraction is smaller than lanthanoid contraction.b)There is no actinoid contraction observed.c)Actinoid contraction is greater than lanthanoid contraction.d)Actinoid contraction is equally same as lanthanoid contraction.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statement is true?a)Actinoid contraction is smaller than lanthanoid contraction.b)There is no actinoid contraction observed.c)Actinoid contraction is greater than lanthanoid contraction.d)Actinoid contraction is equally same as lanthanoid contraction.Correct answer is option 'C'. Can you explain this answer?.
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