Both the planet Mercury and the chemical mercury - also written as Hg - are named after the Roman god Mercury (latin: Mercurius), known for speed and mobility. The chemical is only named after the...
There is no mercury in Mercury.
Atmospheric Composition of Mercury:
42% Molecular oxygen
29.0% sodium
22.0% hydrogen
6.0% helium
0.5% potassium
Trace amounts of argon, nitrogen, carbon...
The planet was named by the Romans after Mercury, the messenger to the gods, because they likened its quick movement across the sky to the speed at which the messenger was believed to move.