Learn Atomic Structure
Master elements, particles, isotopes, electron shells, and quantum orbitals through guided visual lessons.
Learning path
7 lessons- 1
What Is an Atom?
Meet the building block of matter: a dense nucleus of protons and neutrons, surrounded by electrons in energy levels.
Beginner~6 minbasicsstructureparticlesHCOStart lesson - 2
Protons Define the Element
The atomic number is a proton count — and changing it changes what the element is.
Beginner~5 minatomic numberprotonsidentityHCOStart lesson - 3
Neutrons and Isotopes
Same element, different mass: how neutron count creates isotopes like carbon-12 and carbon-14.
Beginner~6 minisotopesneutronsstabilityHCUStart lesson - 4
Electrons and Shells
How electrons fill simplified energy levels, and why the outermost shell decides an element's chemistry.
Intermediate~7 minelectronsshellsvalenceNaClNeStart lesson - 5
Bohr Model vs Quantum Cloud
Rings vs probability clouds: what the Bohr model gets right, and what quantum mechanics actually says.
Advanced~8 minquantumorbitalsmodelsHCFeStart lesson - 6
Reading the Periodic Table
Decode any element tile, then read the table's deeper structure: groups, periods, blocks, and categories.
Intermediate~8 minperiodic tablegroupsblocksHHeFeAuUStart lesson - 7
Comparing Elements
Put elements side by side — atomic number, mass, shells, category — and see why small proton differences matter enormously.
Intermediate~6 mincomparisonanalysistrendsCOAuUStart lesson