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Isotope Notation & Average Atomic Mass
AP Chemistry · Unit 1 Atomic Structure
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Learning Objectives
Read isotope notation: mass number & atomic number
Calculate average atomic mass from isotope abundances
Determine protons, neutrons, electrons from notation
Understand weighted average concept
Formula
Avg Mass = Σ(mass_i × abundance_i)
Protons = Atomic Number (Z)
Neutrons = Mass Number − Z
Electrons = Z (neutral atom)
Tags
isotope
atomic mass
abundance
AP Chemistry