Calculating Average Atomic Mass
Grade 11th Grade · Science · 35 min
What's Included
Learning Objective
I can calculate the average atomic mass of an element given the masses and abundances of its isotopes.
Warm-Up Video
Tyler DeWitt · 13:19
Atomic Mass: Introduction
Guided Notes
3 key concepts
- 1
Atomic mass is a weighted average of the masses of different isotopes of an element.
- 2
Isotopes of an element have the same number of protons but different numbers of neutrons.
- 3
To calculate the weighted average, multiply the mass of each isotope by its percent abundance (expressed as a decimal) and then add those values together.
Practice Questions
3 questions · Short answer
Exit Ticket
Quick comprehension check
“Element X has two isotopes: X-200 and X-202. If the abundance of X-200 is 60% and the abundance of X-202 is 40%, calculate the average atomic mass of element X. Show your work.”
Complete Lesson Package
Get all 3 ready-to-use resources:
