Neon - Occurrence

Occurrence

Stable isotopes of neon are produced in stars. 20Ne is created in fusing helium and oxygen in the alpha process, which requires temperatures above 100 megakelvins and masses greater than 3 solar masses.

Neon is abundant on a universal scale; it is the fifth most abundant chemical element in the universe by mass, after hydrogen, helium, oxygen, and carbon (see chemical element). Its relative rarity on Earth, like that of helium, is due to its relative lightness, high vapor pressure at very low temperatures, and chemical inertness, all properties which tend to keep it from being trapped in the condensing gas and dust clouds which resulted in the formation of smaller and warmer solid planets like Earth.

Neon is monatomic, making it lighter than the molecules of diatomic nitrogen and oxygen which form the bulk of Earth's atmosphere; a balloon filled with neon will rise in air, albeit more slowly than a helium balloon.

Mass abundance in the universe is about 1 part in 750 and in the Sun and presumably in the proto-solar system nebula, about 1 part in 600. The Galileo spacecraft atmospheric entry probe found that even in the upper atmosphere of Jupiter, the abundance of neon is reduced (depleted) by about a factor of 10, to a level of 1 part in 6,000 by mass. This may indicate that even the ice-planetesimals which brought neon into Jupiter from the outer solar system, formed in a region which was too warm for them to have kept their neon (abundances of heavier inert gases on Jupiter are several times that found in the Sun).

Neon is rare on Earth, found in the Earth's atmosphere at 1 part in 55,000, or 18.2 ppm by volume (this is about the same as the molecule or mole fraction), or 1 part in 79,000 of air by mass. It comprises a smaller fraction in the crust. It is industrially produced by cryogenic fractional distillation of liquefied air.

Read more about this topic:  Neon

Other articles related to "occurrence, occurrences":

Co-occurrence Networks
... Co-occurrence networks are generally used to provide a graphic visualization of potential relationships between people, organizations, concepts or ... The generation and visualization of co-occurrence networks has become practical with the advent of electronically stored text amenable to text mining ... By way of definition, co-occurrence networks are the collective interconnection of terms based on their paired presence within a specified unit of text ...
Catalan Name - Spain's Other Languages - Ceuta and Melilla
... North African cities of Ceuta and Melilla (respectively registered 10,410 and 7,982 occurrences), due to immigration from Morocco ... it is not unusual to encounter a man named Mohamed Mohamed Mohamed the first occurrence is the name, the second occurrence is the paternal surname, and the third ...
Levyne
... Typical occurrence is as an alteration and vesicle filling mineral in basalts ... calcium variety was first described in 1821 for an occurrence in Dalsnipa, Sandoy, Faroe Islands ... The sodium variety was described in 1997 for an occurrence in Chojabaru, Nagasaki Prefecture, Japan ...
Cromium - Characteristics - Occurrence
... Although rare, deposits of native chromium exist ... The Udachnaya Pipe in Russia produces samples of the native metal ...

Famous quotes containing the word occurrence:

    One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.
    Oscar Wilde (1854–1900)