However, if the zinc Known as the symbol Zn in the periodic table, a brittle metal which is silvery-greyish in appearance with the removal of oxidation. gets scratched, then it still prevents corrosion For an object to become corroded or the process of corroding. and that's because zinc Known as the symbol Zn in the periodic table, a brittle metal which is silvery-greyish in appearance with the removal of oxidation. is more reactive than iron. This means that the zinc Known as the symbol Zn in the periodic table, a brittle metal which is silvery-greyish in appearance with the removal of oxidation. corrodes instead of the iron. Using a more reactive metal like this is called sacrificial Giving up something for the sake of it benefiting someone or something else. protection To shield or defend something. . You'll be expected to use that term in your exam.