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A noble metal is ordinarily regarded as a metallic element that is generally resistant ... graphite is more noble than silver and the relative nobility of many ...
Graphite (/ ˈ ɡ r æ f aɪ t /) is a crystalline allotrope (form) of the element carbon. It consists of many stacked layers of graphene, typically in the excess of hundreds of layers. Graphite occurs naturally and is the most stable form of carbon under standard conditions.
From left to right in the periodic table, the nonmetals can be divided into the reactive nonmetals and the noble gases. The reactive nonmetals near the metalloids show some incipient metallic character, such as the metallic appearance of graphite, black phosphorus, selenium and iodine. The noble gases are almost completely inert.
The difference can be measured as a difference in voltage potential: the less noble metal is the one with a lower (that is, more negative) electrode potential than the nobler one, and will function as the anode (electron or anion attractor) within the electrolyte device functioning as described above (a galvanic cell).
Diamond is an excellent electrical insulator, but graphite is an excellent conductor. Diamond is an excellent thermal conductor, but some forms of graphite are used for thermal insulation (for example heat shields and firebreaks). At standard temperature and pressure, graphite is the thermodynamically stable form. Thus diamonds do not exist ...
The electrical conductivity of graphite exceeds that of some metals; [n] Selenium can be drawn into a wire; [51] Radon is the most metallic of the noble gases and begins to show some cationic behavior, which is unusual for a nonmetal; [96] and; In extreme conditions, just over half of nonmetallic elements can form homopolyatomic cations. [o]
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Carbon is also used in the form of graphite, for example as the lead in pencils. Diamond , another form of carbon, is commonly used in jewelry. [ 18 ] Carbon fibers are used in numerous applications, such as satellite struts, because the fibers are highly strong yet elastic.