Answer :

The atomic mass of some elements are in fractions because they exist as a mixture of isotopes of different masses. The atomic mass arises in fraction because of this mixture.


Mass =


Note- Isotopes are atoms of the same element having a same atomic number but different atomic masses due to the presence of different numbers of neutrons.


Ex- Carbon-12 and Carbon-14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons but both have 6 protons.

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