Interesting facts about mercury

It is the smallest planet (not including Pluto) and the closest to the sun. Mercury does not have any moons.

--Since this question is located in the Chemistry section, I'll ignore the above answer and add my own, although the above statements are true given Pluto is no longer a planet.

Mercury is known as quicksilver. Mercury is the only metal that is liquid at standard temperature and pressure (STP = 0 degrees Celsius and 100 kPa). Mercury was named after the Roman god of the same name.
Yes.
Mercury has an atmospere.