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Most forms of kelp have 500-1500 ppm (parts per million) of iodine; nori has 15 ppm. Toasting doesn't affect seaweed's iodine content, so eat it in whatever form you like best, but don't depend only on nori to boost your iodine levels.
Iodine is a bluish-black, lustrous solid. Although it is less reactive than the elements above it in group 17 (fluorine, chlorine and bromine) it still forms compounds with many other elements. Although iodine is a non-metal, it displays some metallic properties.