I heard from many people that it' comes from stars and it's found no where on earth
Technetium is not a naturally-occurring element; it was created in a laboratory.
Technetium is a man made element; natural technetium exist only in ultra traces in uranium deposits.
Technetium is the only element that has not been found in nature but has been produced synthetically.
Technetium is an artificial chemical element.
Technetium is a chemical element that is primarily produced artificially and is typically found in powdery form. It does not have a natural texture as it is a synthetic element with no stable isotopes. Since it is not found in nature and has a short half-life, technetium is mainly used in nuclear medicine and as a tracer in medical imaging.
Technetium is an artificial chemical element, a solid metal.
Technetium is an artificial chemical element and is extracted from fission products, prepared by neutron activation or by irradiation in particles accelerators.
Technetium is an artificial chemical element; the natural Tc exist only in infinitesimal amounts in some uranium ores.
Technetium is an artificial chemical element.
Element 43 was named technetium as a reference to the Greek word "technetos," meaning artificial. This name was chosen because technetium is the first element to be artificially produced in a laboratory rather than being found in nature.
Technetium. Now technetium is considered also a natural chemical element.
All isotopes of technetium are radioactive. Technetium is found only in trace quantities in nature, and then usually only in certain ores where it is a product of radioactive decay. All of the technetium used is synthetic.