Question: How to temporarily reassign I?

Hi

Im trying to make a small maple document, where i can calculate the moecule mass of any molecule. I want to assign all atoms with a value for its atom mass, but it will not let me unassign I, as this is the standard unit for imaginary numbers. Is there any way i can unassign I and give it a new value just in the current instance of the program? I dont want it to unassign I in other documents.

Thank you in advance

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