An element has two isotopes: isotope A with a mass of 10.0 a...

Question Analysis
This question evaluates the student's ability to calculate the average atomic mass of an element given the masses and natural abundances of its isotopes.

Key Concept Explanation
The average atomic mass is calculated using the formula: where fractional abundance is the natural abundance divided by 100.

Step-by-step Solution
1. Convert the natural abundances to fractional abundances:
Isotope A:
Isotope B: