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Which is a factor in determining the average atomic mass of an element?


1. atomic number of the most abundant isotope



2. relative abundance of each isotope



3. sum of atomic masses of all isotopes



4. product of atomic masses of all isotopes



5. arithmetic mean of atomic masses of the isotopes

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MiaSeals
The factor in determining the average atomic mass of an element is: 
B or 2 relative abundance of each isotope because the by looking at how many protons , electrons and neutrons the most isotope is of the element has relative abundance. 

Answer: The correct option is 2.

Explanation: Average atomic mass of an element is the summation of the relative abundance of each isotope multiplied by its atomic mass.

Mathematically,

[tex]\text{Average Atomic Mass}=\sum_{i=1}^n(\text{Relative Abundance})_i\times (\text{Mass number})_i[/tex]

From the above relation, it is visible that the average atomic number of an element is dependent on relative abundance of each isotope.

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