Einsteinium
hbomb (hydrogen bomb)
Niobium was discovered first.
Element number 6 was one of the first elements discovered, so it is not widely known who discovered it.
helium
potassium
Hydrogen was the first.
There is no record of the very first element that was discovered, but the first one was probably oxygen since it is the air we breathe or Gold because it is a distinct, and shiny metal.
This element is the metal strontium (Sr).
Peter Armbruster, Gottfried Munzenberg, and Sigurd Hofmann discovered the element Darmstadtium . The element was named after Darmstadt, Germany where it was first produced.
The first element to be discovered was probably copper or gold. They would have been discovered by hunter-gatherers or early farmers. Its discovery cannot be credited to any single person.
Radioactivity is discovered on uranium.
Elements are discovered, they are not invented.