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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) ... had been contentious before 1974, although by that time a consensus had formed that Mercury, like the Moon, lacked any substantial atmosphere.

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

Oct 17, 2016 ... But Mercury isn't ideally located for an atmosphere. ... back onto the planet, some of it drifts away, forming a comet-like tail behind the planet.

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 ...

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 ...

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

When you look at an image of Mercury, it looks like a dry, airless world. But you might be surprised to know that Mercury does have an atmosphere. Not the.

cseligman.com/text/planets/mercatmos.htm

Discussion of what passes for the atmosphere of Mercury. ... from the Sun, and that's what the Sun is made of, and as you will see hydrogen escapes more easily ...

solarsystem.nasa.gov/planets/mercury/indepth

Instead of an atmosphere, Mercury possesses a thin exosphere made up of atoms blasted off the surface by the solar wind and striking micrometeoroids.

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 ...

sciencing.com/chemicals-make-up-mercurys-atmosphere-8800.html

Among other discoveries, the 2008 Messenger spacecraft mission has revealed new information on the chemicals that make up Mercury's atmosphere.