Question

sep analyze data look at the graphs. how does an elements atomic mass compare to the mass number of its most abundant isotope?

Explanation:

Step1: Recall definitions

The atomic mass of an element is the weighted - average mass of all of its isotopes based on their natural abundances. The mass number of an isotope is the sum of the number of protons and neutrons in its nucleus.

Step2: Analyze relationship

The most abundant isotope contributes the most to the atomic mass of the element. Usually, the atomic mass of an element is close to the mass number of its most abundant isotope. But they are not exactly the same because the atomic mass takes into account the small contributions from other less - abundant isotopes.

Answer:

The atomic mass of an element is usually close to the mass number of its most abundant isotope, but not exactly the same due to the contributions of other less - abundant isotopes.