Reason of lanthanoid contraction is...

Reason of lanthanoid contraction is

A

negligible screening effect of f-orbitals

B

increasing nuclear change

C

decreasing nuclear charge

D

decreasing screening effect

Text Solution

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The correct Answer is:

A

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 thieir diffused shape which unable to counterbalance the effect to the increased nuclear charge. Hence, the net results is a contraction in size of lanthanoids.

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Knowledge Check

Reason of lanthanide contraction is

A

negligble sereening effect of f-orbital

B

increasing unuclear charge

C

decreasing nuclear charge

D

decreasing screening effect

Lanthanoid contraction means :

A

small atomic sizes of lanthanoid elements

B

small ionic size of lanthanoid ions.

C

smaller atomic size of lanthanoids as compared to transition element in the same period

D

decrease in atomic and ionic radii of the element of lanthanoid series in moving from left to the right.

Because of lanthanoid contraction :

A

separation of the elements is possible

B

there is a very small difference in the atomic size of the transition metals of 5th and 6th period and present in the same group.

C

there is a gradual decrease in the basic strengths of the hydroxides of lanthanoids

D

All are correct.

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