fermium
neptunium
Plutonium is a synthetic element that is radioactive. It does not occur naturally in nature and must be artificially produced through the nuclear fission of uranium.
Darmstadtium is a synthetic radioactive element. It does not exist in nature.
Californium is an artificial radioactive chemical element.
Yes, nobelium is an artificial element and radioactive.
Rutherfordium is not found in nature. It is a radioactive synthetic element.
Meitnerium is a synthetic radioactive element. It is not found in nature.
Copernicium is a synthetic radioactive element. It does not exist in nature.
Nobelium is a radioactive, artificial chemical element.
Mendelevium is an artificial chemical element, radioactive, unstable.
Fermium is an artificial chemical element.
Bohrium is a synthetic radioactive element. It does not exist in nature.