in presence of metallic Gd in tantalum containers. Gadolinium also forms the sesquichloride , which can be further reduced to GdCl by annealing at 800 C. This gadolinium(I) chloride forms platelets with layered graphite-like structure.

Isotopes

Naturally occurring gadolinium is composed of the element's six stable isotopes--¹⁵⁴Gd, ¹⁵⁵Gd, ¹⁵⁶Gd, ¹⁵⁷Gd, ¹⁵⁸Gd, and ¹⁶⁰Gd--as well as the primordial radionuclide

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