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The atmosphere of Mercury consists of small amounts of helium, hydrogen, oxygen and sodium. It is very thin.
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en.wikipedia.org/wiki/Atmosphere_of_Mercury

Mercury has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and ...

www.space.com/18644-mercury-atmosphere.html

Oct 17, 2016 ... Of all the planets in the solar system, Mercury has the thinnest atmosphere, thinner than even Mars. Several components are constantly ...

www.windows2universe.org/mercury/Atmosphere/atmosphere.html

Aug 11, 2010 ... Mercury's thin atmosphere contains hydrogen, helium, and oxygen. It also has smaller amounts of sodium, potassium, calcium, and magnesium ...

cseligman.com/text/planets/mercatmos.htm

Mercury doesn't have any atmosphere in the normal sense of the word, because what little gas it has is trillions of times thinner than the air at the surface of the ...

www.universetoday.com/22088/atmosphere-of-mercury

Mar 12, 2012 ... Mercury's original atmosphere dissipated shortly after the planet formed 4.6 billion years ago with the rest of the Solar System. This was ...

www.spaceanswers.com/solar-system/what-is-mercurys-atmosphere-like

Dec 10, 2014 ... Asked by Lana Freedman. Mercury's atmosphere is incredibly thin. With a mass of about 5.5 per cent that of the Earth this planet has a far ...

solarsystem.nasa.gov/planets/mercury/indepth

Temperatures on Mercury's surface can reach 800 degrees Fahrenheit (430 degrees Celsius). Because the planet has no atmosphere to retain that heat, ...

coolcosmos.ipac.caltech.edu/ask/26-Does-Mercury-have-an-atmosphere-

Mercury has an extremely thin atmosphere which is made up of atoms blasted off its surface by the Solar wind, a constant stream of particles coming from the ...

web.utah.edu/astro/Mercury.html

Mercury has what is called an Exosphere. It is unlike Earth's atmosphere which is made up of gasses like Nitrogen, Oxygen, Carbon Dioxide, et. al. that are ...