An inventory of the "best" metals of all kinds
Metals are not strange to everyone. They exist widely in nature and are widely used in life. It can be said that metals are very important and most widely used in modern industry. Today zhuzhou jinding said those "most metal", there are widely known, there are unknown. Whether you know it or not, check it out. See below for details.
Most metals --
Aluminum: about 8 percent of the earth's crust, the earth is full of aluminum compounds, common soil, also contains a lot of alumina.
The lightest metal
Lithium: equivalent to half the weight of water, it floats not only on water but also in kerosene.
The hardest metal to melt --
Tungsten: melting point 3410℃, boiling point 5700℃. When the lamp is on, the temperature of the filament can be as high as 3000℃. Only tungsten can withstand such a high temperature.
Least metal --
Polonium: extremely small amount in the earth's crust.
The metal most capable of absorbing gases
Palladium: at room temperature, 1 volume of metal palladium can absorb 900-2800 volumes of hydrogen.
The most malleable metal
Gold: 1 gram of gold can be drawn into a wire 4,000 meters long; If beat into gold foil, the thickness of up to 5×10-4 mm.
The most conductive metal
Silver: its electrical conductivity is 59 times that of mercury.
The most expensive metal --
Californii: in 1975, the californium produced by the world was only about one gram, and the price of one gram was about one billion us dollars.
The most easily applied superconducting element
Niobium: when cooled to an ultra-low temperature of 263.9℃, it transforms into a superconductor with little resistance.
The heaviest metal
Osmium: iridium weighs 22.65 tons per cubic meter. Its density is about 2 times that of lead and 3 times that of iron.
The hardest metal
Sodium: its mohs hardness is 0.4, at room temperature can be cut with a knife.
The metal with the lowest melting point
Mercury: its freezing point is - 38.7℃.
The first metal to be used --
Copper: according to research, the earliest bronze ware in China has a history of more than 4000 years.
The metal with the largest liquid range
Gallium: its melting point is 29.78℃, boiling point is 2205℃.
The metal most likely to generate an electric current when exposed to light
Cesium: its main use is to produce a variety of photocells.
The metal most afraid of cold --
Tin: when the temperature is lower than -13.2℃, tin will begin to crumble when the temperature is lower than -30 ~ -40℃, will immediately become powder, this phenomenon is often called "tin epidemic disease".
The most toxic metal to humans
Polonium: 486 million times more lethal than arsenic, the most potent carcinogen, with 1×10-6 grams of polonium causing cancer.
The largest reserves of radioactive elements in seawater
Uranium: estimated at 4 billion tons, 1,544 times the amount found on land.
The largest natural gold, discovered by the star of hope gold company in hilend, Australia on October 19, 1872, weighs 214.3 kg.
The largest natural silver, found in the Sonora region of Mexico, weighs 1026.5 kilograms.
The purest metal is germanium, purified with a regional melting technique, with a purity of "thirteen ninths" (99.999999999%).