Question:
In which of the following, elements are correctly arranged in the decreasing order of atomic radii?
In which of the following, elements are correctly arranged in the decreasing order of atomic radii?
Show Hint
Due to lanthanoid contraction,
\[
\boxed{
\text{Atomic radius decreases from Ce to Lu.}
}
\]
Eu is relatively larger because of its stable half-filled
\[
\boxed{4f^7}
\]
configuration.
Updated On: Jul 18, 2026
- Eu \(>\) Ce \(>\) Gd \(>\) Ho
- Ce \(>\) Eu \(>\) Gd \(>\) Ho
- Gd \(>\) Eu \(>\) Ce \(>\) Ho
- Ho \(>\) Ce \(>\) Eu \(>\) Gd
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Recall the lanthanoid contraction.
Across the lanthanoid series, atomic radii decrease gradually due to poor shielding by \(4f\) electrons.
This phenomenon is called
\[
\boxed{\text{Lanthanoid contraction}.}
\]
Step 2: Compare the given elements. Among the given elements, \[ \boxed{ \mathrm{Eu > Ce > Gd > Ho} } \] is the correct decreasing order of atomic radii.
Step 3: Choose the correct option. Hence, the correct option is \[ \boxed{(A).} \]
Step 2: Compare the given elements. Among the given elements, \[ \boxed{ \mathrm{Eu > Ce > Gd > Ho} } \] is the correct decreasing order of atomic radii.
Step 3: Choose the correct option. Hence, the correct option is \[ \boxed{(A).} \]
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