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Gadolinium contrast medium is generally very safe. Side effects or reactions are uncommon, but can occur. In patients with normal kidney function, most of the gadolinium contrast medium injected (over 90%) is passed out in the urine within 24 hours.
Best Answer: Gadolinium has 64 electrons and the same number of protons. As for the number of neutrons, this varies because Gadolinium has many isotopes. Source(s): See here for more information: http://en.wikipedia.org/wiki/Gadolinium