The correct answer is osmium (Os). It has an atomic mass of 190.23, which is higher than the atomic masses of platinum (Pt), lead (Pb), and tungsten (W).
Osmium is a very dense, hard, and brittle metal. It is the densest element at standard temperature and pressure, and the second densest element overall, after iridium. Osmium is also the most corrosion-resistant metal, and it is used in many applications where high durability is required, such as in electrical contacts and spark plugs.
Platinum is a silvery-white, ductile, and malleable metal. It is one of the most precious metals, and it is used in jewelry, dentistry, and electronics. Platinum is also a good catalyst, and it is used in catalytic converters and fuel cells.
Lead is a soft, malleable, and ductile metal. It is a relatively poor conductor of electricity, and it is used in batteries, ammunition, and radiation shielding. Lead is also a toxic metal, and it can cause lead poisoning if ingested.
Tungsten
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