=) The atomic mass of an atom is the measure of the mass of the protons plus the neutrons. Why is is not a whole
number?
a.
Because neutrons weigh more than protons
b. Because protons weigh more than electrons
C.
Because it is an average of the naturally occurring isotopes, which each have different amounts of neutrons
and so different atomic masses.
Because it is an average of the naturally occurring ions, which each have different amounts of electrons and
so different atomic masses.
d.