Question

5 Why are atomic masses of most of the elements are fractional
and not whole number?
please answer the question ​

Answer 1

Answer:

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. Isotopes vary in abundance in the universe for a variety of reason. The most common isotopes are usually ones that are formed from nuclear fusion in the suns core.

Answer 2

Answer:

atomic masses are actually avg of their available isotopes so most of the atomic masses are fractional