Technetium is a man made element.
Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally.
There are 94 naturally occurring elements on the periodic table. These elements range from hydrogen (1) to uranium (92), with elements 93 (neptunium) and 94 (plutonium) also occurring in nature, though less commonly.
All or almost all elements have radioactive isotopes if artificial isotopes are included. Among the naturally occurring elements, uranium, polonium, radium, and thorium have naturally occurring radioactive isotopes on earth.
There are many elements that have only one naturally occurring isotope. When you get to transuranic elements the elements all have no naturally occurring isotopes. But all elements have isotopes, they just have to be created, maybe in a nuclear reactor or particle accelerator or a supernova explosion.
Molybdenum has a total of 20 isotopes, but only seven of them are naturally occurring. The most stable isotope of molybdenum is Mo-98.
Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally.
Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally.
Elements 1-92 except 43 (technetium) and 61 (promethium) occur naturally. So, there are 90 naturally occurring elements.
There are 94 naturally occurring elements on the periodic table. These elements range from hydrogen (1) to uranium (92), with elements 93 (neptunium) and 94 (plutonium) also occurring in nature, though less commonly.
All or almost all elements have radioactive isotopes if artificial isotopes are included. Among the naturally occurring elements, uranium, polonium, radium, and thorium have naturally occurring radioactive isotopes on earth.
There are about 112 elements identified and for the time being 6 more proposed. Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally. All elements after atomic number 92, are man made.
There are many elements that have only one naturally occurring isotope. When you get to transuranic elements the elements all have no naturally occurring isotopes. But all elements have isotopes, they just have to be created, maybe in a nuclear reactor or particle accelerator or a supernova explosion.
Molybdenum has a total of 20 isotopes, but only seven of them are naturally occurring. The most stable isotope of molybdenum is Mo-98.
Different elements have between 0 and 10 naturally occurring isotopes, and between about 3 and 25 if you also include artificially prepared and characterized ones.
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.
Practically none, though it seems plausible that trace amounts of Cm-247 exist in uranium ore.
Naturally occurring niobium is composed of one stable isotope, 93Nb.However in the lab, at least 32 radioisotopes had been synthesized.