Answer to Question #84658 in Inorganic Chemistry for Adarsh

Question #84658
Even though actinides show similar variations in magnetic properties as that of
lanthanides, their magnetic properties are more complicated. Explain.
Expert's answer

Lanthanoids are involved in the filling of 4f-orbitals whereas actinoids are involved in the filling of 5f-orbitals. The binding energy of 4f-electrons is comparatively less than that of 5f-electrons. The shielding effect of 5f-electrons is less effective as compared to that of 4f-electrons.

The paramagnetic properties of lanthanoids can be easily explained but this explanation is difficult in case of actinoids. Lanthanides are non-radioactive in nature except promethium whereas all actinide series elements are radioactive. Lanthanides do not have a tendency to form oxocations, but several oxocations of actinide series exist. The compounds formed by lanthanides are less basic on the other hand the compounds of actinides are highly basic.

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