3000BC
yttrium was discovered in the year 1794.
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
Potassium is an element, I think you asking when it was discovered
Gallium, in the year 1875.
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.
Ununbium by Hoffman and Victor.