For Each of the Elements Below, There Are Only Two

Multiple Choice

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

A) ⁶Li and ⁷Li
B) ⁷⁹Br and ⁸¹Br
C) ¹⁰B and ¹¹B
D) ¹²⁶I and ¹²⁷I
E) ⁵⁰V and ⁵¹V