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You add or remove one or more neutrons from each atom.
Copernicium is a synthetic element that does not occur naturally in the environment. It is produced in laboratories by bombarding isotopes of other elements with high-energy particles.
Europium does occur naturally in low concentrations, but it is mainly produced synthetically due to its scarcity in the Earth's crust. It is commonly used in a variety of applications, such as in phosphors for electronic displays and fluorescent lamps.
Bismuth is the only naturally-occurring element that has no stable isotopes. Technetium and promethium are the other two elements that do not have any stable isotopes and are only found in trace amounts or are synthetically produced.
The most radioactive element in the transition metals group is technetium. It has no stable isotopes and is typically produced in nuclear reactors as a byproduct. Its most common radioactive isotope is technetium-99, which is used in various medical procedures such as imaging scans.