Use these 3 free Unit 03 practice problems as your starting point. When you want more reps on particle counts, isotopes, ions, and atomic notation, premium unlocks Quick Sets of 3, Standard Sets of 9, and Extended Sets of 18 from this 84-problem bank.
3 Free Sample Problems
Try these to see whether particle counts and symbols are becoming automatic or still deserve a careful second look.
#4Average Atomic Mass
Chlorine has two isotopes: Cl-35 (mass = 34.969 amu, abundance = 75.77%) and Cl-37 (mass = 36.966 amu, abundance = 24.23%). Calculate the average atomic mass of chlorine in amu.
#5Rutherford's Experiment
Rutherford's gold foil experiment showed that most alpha particles passed straight through the foil. What did this indicate about atomic structure?
#6Nuclear Symbol + Ion
Element X has the nuclear symbol ⁵⁶₂₆X and forms a 2+ ion. Which set of values — protons, neutrons, electrons — is correct for the ion?
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