ATPT - Average Atomic Mass (Lesson)

Average Atomic Mass

Introduction

Average atomic mass is not obtained from a single atom. Rather, average atomic mass is the average mass per atom of a typical sample of any certain element. This calculation takes into account the abundance of the isotopes that exist for any element. While you complete this lesson, keep in mind that isotopes have the same atomic number but differing numbers of neutrons.

A Closer Look at Average Atomic Mass

Watch the Closer Look video, produced by GPB, to learn how to calculate the average atomic mass using percent abundance.

Isotope Challenge

Click here to download the note taking guide for Chemistry Matters Unit 3H Isotope Practice Problems. Links to an external site.

Click here to download the key to the questions to consider for Chemistry Matters Unit 3H Isotope Practice Problems. Links to an external site.

More on Isotopes

Below is the isotope notation for copper-63. Click on each part of the notation to learn more.

Three Isotopes of an Element

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