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.
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.
Californium is an artificial radioactive chemical element.
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.