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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 ... But Mercury isn't ideally located for an atmosphere. ... observations suggested that oxygen made up 42 percent of the tiny planet's atmosphere.

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

Aug 11, 2010 ... Mercury's thin atmosphere contains hydrogen, helium, and oxygen. ... Others are made by radioactive decay or when micrometeorites smash ...

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

Mar 12, 2012 ... What is Mercury's atmosphere made of? It has a tenuous atmosphere made up of hydrogen, helium, oxygen, sodium, calcium, potassium and ...

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 ...

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 ...

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

Apr 25, 2017 ... Mercury's extremely thin atmosphere contains many different chemicals. ... Messenger spacecraft mission has revealed new information on the chemicals that make up Mercury's atmosphere. ... What is Mercury Made Of?

www.kidsastronomy.com/mercury.htm

As a result, Mercury is made out of a large percentage of heavier elements, mainly ... Mercury is too small and has too little gravity to hold onto an atmosphere.

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.