Berkelium was a step on the way to discover new artificial elements.
Largely hypothetical. Berkelium is a transuranic element, and perhaps a gram of berkelium has ever existed in all of human history. (If you really want to know anyway, despite the information having no practical use, I suggest Wikipedia, which has a good article on berkelium.)
berkelium is synthetic
berkelium is american
Berkelium is extremely rare, radioactive and unstable; berkelium is not for sale.
Berkelium has the valences 3+ and 4+.
Berkelium has 97 electrons.
Berkelium has 97 electrons.
Berkelium is an artificial element.
We haven't berkelium in the body.
Berkelium is a metal.
Any item has berkelium inside.
Berkelium is not a commercial product.