Question

Why average atomic mass is fractional

Answer 1

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The atomic masses of most elements are fractional because they exist as a mixture of isotopes of different masses.

Most elements occur as a mixture of isotopes of different masses.

The fractional atomic masses arise because of this mixture.

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Answer 2

Answer:

Because atomic mass devised by taking into account the isotopes of elements for example Cl37 exists as 25% Of Cl in atmosphere therefore atomic mass of Cl is 35.5 and not 35

Explanation: