Reason of lanthanoid contraction is

negligible Screening effect of 'f' orbitals

increasing the nuclear charge

decreasing the nuclear charge

decreasing screening effect

Solution

negligible Screening effect of 'f' orbitals

Lanthanoid contraction is the regular decrease in atomic and ionic radii of lanthanides. This is due to the imperfect shielding [or poor screening effect] of f-orbitals due to their diffused shape, which unable to counterbalance the effect of the increased nuclear charge. Hence, the net result is a contraction in size of lanthanoids.

Some More Questions From The d-And-f-Block Elements Chapter

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

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The D-And-f-Block Elements

Reason of lanthanoid contraction is

negligible Screening effect of 'f' orbitals

increasing the nuclear charge

decreasing the nuclear charge

decreasing screening effect

Some More Questions From The d-And-f-Block Elements Chapter

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

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The D-And-f-Block Elements

Reason of lanthanoid contraction is negligible Screening effect of 'f' orbitals increasing the nuclear charge decreasing the nuclear charge decreasing screening effect

Some More Questions From The d-And-f-Block Elements Chapter

The E° (M2+/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Reason of lanthanoid contraction is

negligible Screening effect of 'f' orbitals

increasing the nuclear charge

decreasing the nuclear charge

decreasing screening effect

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?