Total number of lanthanoids (4f-elements)
having 5d electrons in their electronic
configuration are:
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Total number of lanthanides
having 5d electrons: 4.
•Lanthanides are elements that have their 4f shell filled.
•They follow lanthanum.
•The difference in orbital filling pattern is seen, because some elements have 5d energy levels lower than 4f.
•So, they have 4f filled first to achieve stability.
•The electronic configuration of lanthanides are 4f(1−14)6s2.
•This means they have 4f orbitals filled, and then 6s orbitals filled.
•The elements having 5d orbitals filled are - Lanthanum, Cerium, Gadolinium and Lutetium.
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