It is an artificial element that is very rare and difficult to create.
Berkelium is extremely rare, radioactive and unstable; berkelium is not for sale.
Berkelium is an artificial element, extremely rare, unstable and the preparation is very difficult.
Berkelium is a very rare, artificial element, impossible to found in the nature.
Curium and berkelium are artificial chemical elements, very rare, unstable and radioactive. Members of the actinides group.
Berkelium currently has no uses except for scientists to use for basic research.
berkelium is american
berkelium is synthetic
Berkelium is not corrosive.
Berkelium has a silvery appearance.
Berkelium has two electrons on the outer shell.
Any item has berkelium inside.
Berkelium is not a commercial product.