Trivalent lanthanide ion having isotopic magnetic susceptibility is*

The question seems incomplete as it does not specify which particular lanthanide ion we are discussing. However, I can provide a general answer.

Lanthanide ions are trivalent, meaning they have a charge of +3. They are known for their unique magnetic properties, which are due to the presence of unpaired electrons in their 4f orbitals.

The magnetic susceptibility of a substance is a measure of how much it will become magnetized in an applied magnetic field. For lanthanide ions, this can vary depending on the specific ion and its electronic configuration.

Isotopic magnetic susceptibility refers to the variation in magnetic susceptibility due to the presence of different isotopes. As far as I know, this is not a commonly discussed property for lanthanide ions, possibly because the magnetic properties of these ions are dominated by the unpaired 4f electrons rather than nuclear effects.

If you have a specific lanthanide ion in mind, I could provide more detailed information.