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The relative atomic mass of an element is a weighted average of the masses of the atoms of the isotopes - because if there is much more of one isotope then that will influence the average mass much more than the less abundant isotope will.
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Determination of raltive Atomic mass of Isotopes.
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Francis Aston constructed an instrument called mass spectrograph. it was used to identity isotopes of an element on the basis of atomic mass . Modified form of this instrument is called spectrometer or dempster's mass spectrometer.

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