The correct answer is Sr-84. The lightest specie is the most deflected while the heaviest specie is the least deflected.
In mass spectroscopy, chemical substances can be identified by looking at their respective mass-to-charge ratios of gaseous ions in electric and magnetic fields. The is achieved using a mass spectrometer.
The lightest specie undergoes the greatest deflection while the heaviest specie undergoes the heaviest deflection accordingly in a mass spectrometer.
In this case, Sr-84, is the lightest specie hence it should be the least deflected specie.
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