berkelium is synthetic
Berkelium is an artificial element.
Berkelium is an artificial element.
Berkelium is a solid metal.
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.
Any item has berkelium inside.
Berkelium is not a commercial product.
Berkelium is a metal.
We haven't berkelium in the body.