Why some of the elements have fractional atomic masses?

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Solution

The atomic masses of most elements are fractional because they exist as amixture of isotopes of different masses. Most elements occur as amixture of isotopes of different masses. The fractional atomic masses arise because of this mixture. ...
mass= total mass of all atoms/number of atoms.
Before we calculate the average mass of atoms, let's use an analogy.

Assume that a class contains 10 boys (mass 60 kg) and 20 girls (mass 55 kg).
What is the average mass of the students.

Mass of boys = 600 kg
Mass of girls = 1100 kg
Total mass of students = 1700 kg

Avg. mass of 1 student=1700 kg30 students=56.7 kg/student

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