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

question 98

Multiple Choice

Indium has two naturally occurring isotopes with masses given in the table below. The relative atomic mass given for antimony on the periodic table is 114.82. When a natural sample of indium is placed in a mass spectrometer, which of the following will be true?

• A) Three peaks will be observed at 112.9043, 114.82, and 114.9041 amu.
• B) Two peaks will be observed and the ¹¹³In will be larger.
• C) One peak will be observed at the average relative atomic mass.
• D) Two peaks will be observed and the ¹¹⁵In will be larger.
• E) Not enough information is given to answer the problem.