What is the atomspere in Mercury?

Answer 1

Mercury doesn't have much of an atmosphere. The atmospheric pressure there is a trillion times less than the pressure on earth. It is made up of 42% oxygen, 29% sodium, 22% hydrogen, 6% helium, 0.5% potassium, and trace amounts of argon, nitrogen, carbon dioxide, water vapor, xenon, krypton, and neon.

Answer 2

Mercury does not have a thick atmosphere like Earth. Instead, it has an exosphere composed mainly of oxygen, sodium, hydrogen, helium, and potassium. Due to its weak gravity, these gases are not held tightly to the planet and escape into space, creating a very thin and tenuous atmosphere.