For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the lighter isotope is the more abundant one.

Question

Quizplus · Accepted Answer

The lighter isotope of bromine, ⁷⁹Br, has a higher abundance (50.69%) compared to the heavier isotope, ⁸¹Br (49.31%). Answer: C The lighter isotope of boron, ¹⁰B, has a higher abundance (80.1%) compared to the heavier isotope, ¹¹B (19.9%). Both A, D, and E have only one naturally occurring isotope.

For Each of the Elements Below, There Are Only Two