Question:
Which of the following elements has completely filled 4 f orbital at the expected ground state configuration?
Which of the following elements has completely filled 4 f orbital at the expected ground state configuration?
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Ytterbium is [Xe] 4f14 6s2.
Updated On: Oct 1, 2026
- \(\text{La}\)
- \(\text{Yb}\)
- \(\text{Eu}\)
- \(\text{Gd}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
The 4f subshell holds 14 electrons. Lanthanoids fill it from La (4f0) to Lu (4f14).
Step 2: Detailed Explanation
\(\text{La}\): \(4f^0 5d^1 6s^2\). \(\text{Eu}\): \(4f^7 6s^2\). \(\text{Gd}\): \(4f^7 5d^1 6s^2\). \(\text{Yb}\): \(4f^{14} 6s^2\).
Only Yb (Z = 70) has the 4f subshell completely filled with 14 electrons.
Final Answer:
Ytterbium has a fully filled 4f subshell, option (B). \[ \boxed{\text{Yb}} \]
The 4f subshell holds 14 electrons. Lanthanoids fill it from La (4f0) to Lu (4f14).
Step 2: Detailed Explanation
\(\text{La}\): \(4f^0 5d^1 6s^2\). \(\text{Eu}\): \(4f^7 6s^2\). \(\text{Gd}\): \(4f^7 5d^1 6s^2\). \(\text{Yb}\): \(4f^{14} 6s^2\).
Only Yb (Z = 70) has the 4f subshell completely filled with 14 electrons.
Final Answer:
Ytterbium has a fully filled 4f subshell, option (B). \[ \boxed{\text{Yb}} \]
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