The most abundant isotope of iridium is Iriduium-192.
An element is composed of isotopes. The isotopes of an elements have different mass numbers but the same atomic number. These difference in the mass number is caused by differences in the number of neutrons.
We can see that there are three isotopes of Iridium that are common. The most abundant isotope of iridium is Iriduium-192.
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