Naturally occurring lithium (Li)consists of only two isotopes, Li-6 (6.02 u)and Li-7 (7.02 u), where the isotopic masses are given in parentheses. Use the periodic table and determine which isotope is present in the larger percentage in the natural element.
A)Li-6
B)Li-7
C)each is present at 50%
D)cannot be determined from the information available

Question

Quizplus · Accepted Answer

The atomic mass of lithium on the periodic table is approximately 6.94 u, which is closer to the mass of Li-7 (7.02 u) than to Li-6 (6.02 u). This suggests that Li-7 is present in a larger percentage in natural lithium, as the average atomic mass is more influenced by the isotope with the greater abundance.

Naturally Occurring Lithium (Li)consists of Only Two Isotopes, Li-6 (6