Atomic Structure
Build intuition for atoms, isotopes, and periodic trends.
Levels
LEVEL 1
Isotopes & Atomic Mass
Not started
Calculate average atomic mass using isotopic abundances.
10 questions • ~4–6 min
LEVEL 2
Ions & Charge
Locked
Practice common ions, charges, and electron counts.
10 questions • ~4–6 min
LEVEL 3
Electron Configuration
Locked
Write basic electron configurations and identify valence electrons.
10 questions • ~5–8 min
LEVEL 4
Periodic Trends
Locked
Predict radius, ionization energy, and electronegativity trends across the periodic table.
10 questions • ~4–6 min