Berkelium is a chemical element, not first or second.
Berkelium is an artificial element.
Berkelium is not a commercial product.
Berkelium is an artificial element.
We haven't berkelium in the body.
Berkelium is on the periodic table. If it's on the periodic table, it's an element.
The atomic number of berkelium is 97.
Berkelium is only an artificial element.
Berkelium is an artificial chemical element.
Berkelium is a unique chemical element.
Berkelium is a chemical element, doesn't contain other compounds.
Berkelium is an artificial element, radioactive, unstable, solid, metal, atomic number 97 etc.
Berkelium is an artificial chemical element, not found in rocks.