Antimony Has Two Naturally Occurring Isotopes with Masses Given in the Table

Multiple Choice

Antimony has two naturally occurring isotopes with masses given in the table below. The relative atomic mass given for antimony on the periodic table is 121.75.

Which of the following is true?

A) When a sample of antimony is placed in a mass spectrometer, one peak will be observed at the average relative atomic mass.
B) Two peaks will be observed and the ¹²¹Sb will be larger.
C) Two peaks will be observed and the ¹²³Sb will be larger.
D) Three peaks will be observed at 120.9038, 121.75, and 122.90911.
E) Not enough information is given to answer the problem.