Αποτελέσματα Αναζήτησης
The name neon originates from the Greek word νέον, a neuter singular form of νέος (neos), meaning 'new'. Neon is a chemically inert gas, with no known uncharged neon compounds. Existing neon compounds are primarily ionic molecules or fragile molecules held together by van der Waals forces.
Earth’s original atmosphere was rich in methane, ammonia, water vapour, and the noble gas neon, but it lacked free oxygen. It is likely that hundreds of millions of years separated the first biological production of oxygen by unicellular organisms and its eventual accumulation in the atmosphere.
neon (Ne), chemical element, inert gas of Group 18 (noble gases) of the periodic table, used in electric signs and fluorescent lamps. Colourless, odourless, tasteless, and lighter than air, neon gas occurs in minute quantities in Earth’s atmosphere and trapped within the rocks of Earth’s crust.
17 Δεκ 2012 · Neon was first discovered by Morris Travers and William Ramsay in 1898 shortly after the discovery of krypton in the same year. They both froze argon sample with the help of liquid air and slowly evaporated argon under low pressure to collect the new gas.
Overall, neon isotopes clearly identify the noble gases presently degassing from the mantle as solar in origin (see Chapter 6.17 for a discussion of the implications for early Earth history). Taking this composition as the original value of the neon in the atmosphere, most of the atmospheric neon was degassed very early in Earth history and ...
30 Μαρ 2018 · The solar wind implantation on preplanetesimal dust can explain the origin of light volatiles (H, He, and Ne) in the Earth's mantle. The atmospheric neon composition is accounted for by mixing 36% of mantle neon and 64% of neon from a chondritic or cometary source.
The universe provides clues to the history of Earth’s atmosphere, a 100 kilometer-thick layer of many different gases that are kept close to Earth by gravity. One important clue to the past is found in neon, an element that is a billion times more abundant in the universe than on Earth.
