The hardness of berkelium has never been measured.
Only minute quantities of berkelium have ever been synthesized so no hardness measurements have been possible.
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.
Berkelium has 97 electrons, which means it has 7 electron shells.