Henri Becquerel discovered radioactivity and it was the Curies who made experiments about the concept and became known for their d
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The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

Substituting the values in the formula:



The most common isotope of lead is:
Lead - 207.22 amu
The atomic symbol of lead is
. The atomic number of
is 82.
So, the the most common isotope of lead can be written as:
and Lead - 207.22 amu.
Answer:
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.
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Answer: option c. the mixing of solute and solvent molecules
Explanation: