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  4. Which of them is an inner transition element?

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Q. Which of them is an inner transition element?

NTA AbhyasNTA Abhyas 2022

Solution:

$Ce:\left[\right.Xe\left]\right.6s^{2}5d^{1}4f^{1}$ : Last electron enters in $f-$ orbitals, such elements are known as inner transition element.