A MCQ from CIE June 2016, which i cannot reproduce here, gives a
mass spectrum showing only ONE isotope of Copper having mass of
63.5 showing 100% abundance.
The question was to prove which mass spectrum would give an Ar
of 63.5.
The mass spectrum above would give 63.5 as the correct answer
but this was not the answer. Another was the answer which different
isotopes having different Whole number masses of isotope.
My question is all isotopes of an element have Whole number
masses. We have observaed this so far. So we can eliminate any
choice having an isotopic mass in decimal....is this correct?
Correct. The molar mass of any single isotope must be an integer
(since there is no such thing as non-integer number of protons or
neutrons), only averaged molar masses (ie. taking into
consideration the relative abundance of various isotopes) can be
non-integers.
