Answer: The abundance of He-4 isotope is the highest as compared to the other isotope.
Explanation:
Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
The equation used to calculate average atomic mass follows:
[tex]\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex]
We are given:
Two isotopes of helium, which are He-3 and He-4
Average atomic mass of helium = 4.003 amu
As, the average atomic mass of helium is closer to the mass of He-4 isotope. This means that the relative abundance of this isotope is the highest as compared to the other isotope.
Percentage abundance of He-4 isotope = 99.99%
Percentage abundance of He-3 isotope = 0.01 %
Hence, the abundance of He-4 isotope is the highest as compared to the other isotope.
