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Carbon-14 and Uranium-235, to name two.

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16y ago

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What is the weighted-average mass of all the known isotopes for an element?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


Why are most elements radioactive?

Most of the natural occurring (isotopes of) elements are NOT radioactive.Though most of all the known isotopes are radioactive but most of them do NOT naturally occur.


What is the average of all the naturally occurring isotopes of a particular element?

The average of all the naturally occurring isotopes of a particular element are an element's atomic Mass.


Does ogygen have any isotopes?

Yes, oxygen has three naturally occurring isotopes: oxygen-16, oxygen-17, and oxygen-18. Oxygen-16 is the most abundant, making up about 99.76% of naturally occurring oxygen.


What is the mass number of most common naturally occurring isotope of carbon?

Carbon has a few isotopes. The most common naturally occurring isotope of it is C12. Mass number of it is 12.


Is gallium a naturally occurring isotopes?

Yes, gallium does have naturally occurring isotopes. The most common stable isotopes of gallium are gallium-69 and gallium-71, with gallium-69 being more abundant at about 60% and gallium-71 about 40%.


What are the naturally occurring isotopes of lithium?

Lithium has two natural isotopes (6Li and 7Li).


Is radon the element naturally occurring?

The radon isotopes 222Rn and 220Rn are natural isotopes.


The average mass of all the known isotopes of an element is what?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


Is the weight average mass of all the known isotopes for an element?

The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.


What are the naturally occurring isotopes of polonium?

This isotope is 210Po, an alpha emitter with a half life of 138,376 days.


Is tin an isotope?

Tin is an element with ten naturally occurring isotopes.