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Answer:
D. Molybdenum
So a metal is: a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.
So what is molybdenum?
It has the atomic number 42 and is a silvery-gray transition metal. Although the free element is not found in nature, it has an extremely high melting point—the sixth highest of all known elements. It is mostly mined and manufactured for alloying, notably with steel.
Uses for molybdenum metal include:
- An alloying agent gives quenched and tempered steels their hardenability and toughness. Additionally, it increases steels' strength at high temperatures (red-hardness).
- In nickel-based alloys (such Hastelloys) and stainless steels, it gives chemical solutions heat resistance and corrosion resistance.
- Electrodes for forehearths and glass furnaces that use electricity for heating.
- Uses for nuclear energy, such as in missile and aircraft parts (where high temperature resistance is vital).
- As a catalyst in the petroleum refining process.
- In electronic and electrical applications as a filament material.
- As a pillar of support for lightbulbs and radios.
- Electric connections that are arc resistant.
- Sheaths for thermocouples
- Coatings for other metals that prevent corrosion and flames (generally arc deposited for metallising).
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