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Question

Chemistry Question on The Lanthanoids

Non-Ianthanide element is:

A

LaLa

B

LuLu

C

PrPr

D

PmPm

Answer

LaLa

Explanation

Solution

Those element in which last electron enters in the 4f−4 f- orbital are called lanthanoid elements.
There are fourteen elements in the lanthanoid series from Ce(Z=58)Ce(Z=58) to Cu(Z=71)Cu ( Z =71).
Lanthanum (La)(La) is a non-lanthanoid element because the valence electron goes into dd-orbital not in 4f−4 f- orbital.
La(Z=57):[Xe]5d16s2L a(Z=57): [X e] 5 d^{1} 6 s^{2}