Tuesday, January 11, 2005


(Nd), chemical element, rare-earth metal of transition Group IIIb of the periodic table. Neodymium is silvery-white colour and tarnishes in air to form an oxide which chips, exposing the metal to further oxidation. The metal must be sealed in a plastic covering or kept in mineral oil for preservation. It reacts gradually with cold water and rapidly with hot water to liberate


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