Above the core is a 500-kilometer rocky mantle covered by a thin crust of loose rocks and dust. A day on Mercury lasts 59 Earth days. Mercury is the closest planet to the sun. Mercury is a shiny, silvery, liquid metal, sometimes called quicksilver.It is a transition metal with atomic number 80 on the periodic table and an atomic weight of 200.59, and its element symbol is Hg. Atmospheric components. This dime is composed of 90 percent silver and 10 percent copper. While it's an extremely rare element, there's a world of interesting information about mercury. Mercury has an unusually large molten metallic core made up principally of iron and nickel. Mercury dimes are very popular ten-cent pieces produced by the United States Mint from 1916 to 1945. The name ‘quicksilver’ was given to it by people of past civilizations as it formed beads of small parts that showed movement, when dropped on a surface. Mercury also has been used in Ayurvedic medicine. The coin contains a total of just over .072 troy ounces of silver. Mercury is a terrestrial planet. Mercury is the smallest planet in our solar system. The program included a number of unmanned test flights, some including primates, prior to flying human astronauts. What is Mercury’s atmosphere made of? Mercury doesn't really have an atmosphere. Mercury is the smallest and least massive of the eight planets. Conventional medical doctors have used mercury in its gross form for several centuries, and dentists started using mercury fillings in the early 1800s. It is also considered to be a rocky or terrestrial planets and its interior composition is said to be similar to that of our own planet. Rose bowls, made primarily in the 20th century from colored mercury glass, are also sought after by collectors. Silvered-glass objects with acid-etched decoration, often of wheat or flowers, turn up frequently; cut silvered glass is much rarer. (You can tell the difference by … Mercury, or quicksilver as it was called several hundred years ago, derived its name from the Roman god Mercury, and has been a metal that has intrigued men since a long time. Time on Mercury. I assume you are referring to the planet Mercury (Mercury, the metal, is made up of mercury atoms and is not discussed here). It is small and rocky. It has a tenuous atmosphere made up of hydrogen, helium, oxygen, sodium, calcium, potassium and … Mercury is a chemical element with the symbol Hg and atomic number 80. Information about Mercury's composition is based on the Mariner 10 and MESSENGER probes that orbited the planet. Its low surface gravity makes holding on to an atmosphere in the best of circumstances a challenge. What is Mercury Made Of? I won’t waste time going into the toxicity of the material, as this is well known and documented. Mercury Program. Mercury does not have any moons. 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