Ununbium by Hoffman and Victor.
It was discovered in 1789 by Martin Klaproth, a German.
Any element was discovered in 1985.
The Mars Rover was not discovered it was invented.
Ozone i.e. O3 was discovered by Charles Fabry. It was discovered in the year 1913.
1878
yttrium was discovered in the year 1794.
3000BC
The element niobium was discovered by Charles Hatchett in the year 1801. He discovered the element by analyzing a piece of columbite in a museum's collection.
It was discovered in 1789 by Martin Klaproth, a German.
1808 By del rio
Gallium, in the year 1875.
Potassium is an element, I think you asking when it was discovered
Jöns Jakob Berzelius in 1828.
Bismuth was discovered around the year 1400.
Any element was discovered in 1985.
Manganese was discovered as an element in 1774 by Swedish chemist Johan Gottlieb Gahn.
The chemical element yttruim, pronounced IT-ree-em, was discovered in the year 1794 by a Finnish chemist, Johan Gadolin and is named after the town of Ytterby, Sweden.