A long time ago. It go's the whole back to alchemy when it was more commonly known as quick silver. Because of its long history it is hard to say when it was first discovered.
what time oxygen time period was 1774
Mercury's rotation period is 59 Earth days.
Nobody knows for sure who discovered the elemnt mercury. Records show it was used in ancient Babylon, The chemist, Antoinne-Laurent de Lavoisier, is credited with identifying mercury as an element.
From among the objects discovered so far, that would be the planet Mercury with a period of orbital revolution of 88 earth days.Anything with a shorter orbital period would have to spend most of its time closer to the sun than Mercury is.
ancient Greece
A property of that element. An unstable element. A radioactive element
Greek and Romans stuff was discovered in the Renaissance time period.
In 399 B.C
ancient Greece
Prehistory.
Both the planet Mercury and the substance (element) mercury have been known since ancient times. When either was first noticed is not known.
289 b.C