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Molybdenum is a chemical element with symbol Mo and atomic number 42. Molybdenum does not occur naturally as a free metal on Earth; it is found only in various oxidation states in minerals.
M 3001 (OTTO) Molybdenum foil, 0.5mm (0.02in) thick, 99.95% Cas 7439-98-7 - used as armor plating for tanks.