Which of the following is a property of lanthanide contraction?

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Question: Which of the following is a property of lanthanide contraction?

Options:

Correct Answer: Decrease in atomic radius

Solution:

Lanthanide contraction refers to the decrease in atomic radius across the lanthanide series due to poor shielding of f-electrons.

Which of the following is a property of lanthanide contraction?

Which of the following is a property of lanthanide contraction?

Step 1: Understand what lanthanides are. They are a series of 15 elements from lanthanum (La) to lutetium (Lu) in the periodic table.
Step 2: Learn about atomic radius. Atomic radius is the size of an atom, which can change as you move across a series in the periodic table.
Step 3: Know what lanthanide contraction means. It is the phenomenon where the atomic radius decreases as you move from lanthanum to lutetium.
Step 4: Recognize the reason for lanthanide contraction. It happens because the f-electrons (which are added as you go across the series) do not shield the positive charge of the nucleus very well.
Step 5: Conclude that the poor shielding of f-electrons leads to a stronger attraction between the nucleus and the electrons, causing the atomic radius to decrease.

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