Question

the atomic mass of chlorine is 35.45 u. Is it possible for any single atom of chlorine to have a mass number of exactly 35.45? Explain

Answer 1

you really should post this in chemistry or physics.

But a "fractional atomic mass" comes from a mixture of isotopes. atomic mass for a particular isotope are always integer (sum of protons and neutrons)

Answer 2

so it be the same