Question:
Non-Ianthanide element is:
Non-Ianthanide element is:
Updated On: Jun 6, 2024
- $ La $
- $ Lu $
- $ Pr $
- $ Pm $
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The Correct Option is A
Solution and Explanation
Those element in which last electron enters in the $4 f-$ orbital are called lanthanoid elements.
There are fourteen elements in the lanthanoid series from $Ce(Z=58)$ to $Cu ( Z =71)$.
Lanthanum $(La)$ is a non-lanthanoid element because the valence electron goes into $d$-orbital not in $4 f-$ orbital.
$L a(Z=57): [X e] 5 d^{1} 6 s^{2}$
There are fourteen elements in the lanthanoid series from $Ce(Z=58)$ to $Cu ( Z =71)$.
Lanthanum $(La)$ is a non-lanthanoid element because the valence electron goes into $d$-orbital not in $4 f-$ orbital.
$L a(Z=57): [X e] 5 d^{1} 6 s^{2}$
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Concepts Used:
Lanthanoids
Lanthanoids are at the top of these two-row, while actinoids are at the bottom row.
Properties of Lanthanoids
Lanthanoids are inclusive of 14 elements, with atomic numbers 58-71:
- Cerium - Xe 4f1 5d1 6s2
- Praseodymium - Xe 4f3 6s2
- Neodymium - Xe 4f4 6s2
- Promethium - Xe 4f5 6s2
- Samarium - Xe 4f6 6s2
- Europium - Xe 4f7 6s2
- Gadolinium - Xe 4f7 5d1 6s2
- Terbium - Xe 4f9 6s2
- Dysprosium - Xe 4f10 6s2
- Holmium - Xe 4f11 6s2
- Erbium - Xe 4f12 6s2
- Thulium - Xe 4f13 6s2
- Ytterbium - Xe 4f14 6s2
- Lutetium - Xe 4f14 5d1 6s2
These elements are also called rare earth elements. They are found naturally on the earth, and they're all radioactively stable except promethium, which is radioactive. A trend is one of the interesting properties of the lanthanoid elements, called lanthanide contraction.