Practically none, though it seems plausible that trace amounts of Cm-247 exist in uranium ore.
Curium has 20 isotopes and 7 isomers.
All the isotopes of curium have 96 protons.
Curium is an artificial chemical element. Number of neutrons = Atomic mass of an isotope - atomic number of the isotope The atomic number of curium is 96; and atomic mass is 247 so no of neutrons is 151.
Technetium has no stable isotopes but at least 30 artificial ones have been identified.
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.
Naturally occurring niobium is composed of one stable isotope, 93Nb.However in the lab, at least 32 radioisotopes had been synthesized.
How do you calculate percent abundance of an isotope?You find the isotope number and then you calculate that into a fraction and then turn the fraction into a percentage and divide it by the atomic number then times it by the mass and turn that answer into a percent and voila, there you have it.
According to http://www.lenntech.com/periodic-chart-elements/pd-en.htm: Palladium consists of 9 isotopes. According to http://en.wikipedia.org/wiki/Isotopes_of_palladium: Naturally-occurring Palladium consists of 6 isotopes and 18 radioisotopes.
Hydrogen has three stable isotopes: protium (1H), deuterium (2H), and tritium (3H). Among these, protium is the most abundant, making up over 99.98% of naturally occurring hydrogen.
There are 92 naturally occurring elements, with a total of 118 naturally occurring elements in the periodic table. Each element is composed of atoms with a specific number of protons in the nucleus that determines its identity.