Question

The mass spectrum of the element Sb is most likely represented by which of the following?

A. 122 Atomic Mass
B. 121 and 123 Atomic Mass
C. 120, 123 and 124 Atomic Mass
D. 120,121 and 124 Atomic Mass

Answer 1

I think that the answer would be B

Answer 2

The correct answer is B: 121 and 123 Atomic Mass.

Mass spectrometers only detect stable isotopes.

Almost all elements exhibit isotopy. Isotopy is a phenomenon whereby atoms of the same atomic number have different atomic masses. The relative atomic mass of each element is the weighted average of the masses of all its isotopes.

Owing to the phenomenon of isotopy, the relative atomic mass of elements are not whole numbers.

The isotopes recorded by a mass spectrometer are stable isotopes of an element. The two stable isotopes of antimony are  Sb-121 and Sb-123. These two appear in its mass spectrum.

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