Elements are discovered, they are not invented.
Barium is an element and therefore was not 'invented'. It was however first identified by Scheele in 1774 and was first isolated by Sir Humphrey Davy in 1808.
Polonium is an element and was not invented but discovered.
Aluminium always existed. It is an element and a metal which oxidizes easily.
no one did, its an element
Neptunium was obtained for the first time by Edwin McMillan and Philip H. Abelson in 1940 at Berkeley Laboratories. Invented is not the correct word.
The synthetic element nobelium was named after Alfred Nobel, the man who invented dynamite.
Galium invented by King james Lamoste.
Nobody invented it, tin is a naturally occurring element.
Helium is a naturally occurring element and was not invented by anyone.