If an element has three isotopes with known natural abundance percentages, what other information is needed to find the average atomic mass of the element? A. The average mass of the isotopes B. The sum of the masses of the isotopes C. The atomic number of each isotope D. The mass of each isotope

To calculate the average atomic mass of an element with multiple isotopes, you will need the mass of each isotope. By knowing both the mass of each isotope and their natural abundance percentages, you can perform a weighted average to find the overall atomic mass of the element. Additionally, having the average mass of the isotopes is significant to understanding how they contribute to the element's average atomic mass. This requires knowing the actual masses of the isotopes, allowing for an accurate calculation based on their relative abundances.