Periodic Table of Elements (click any element for details)
Click any element for details · Color-coded by category
* Lanthanides/Actinides shown below (镧系/锕系元素)
3D Interactive Atom Model drag to rotate · hover electrons for quantum numbers
Nucleus shows real protons (red) and neutrons (blue). Electrons orbit in shells.
Speed:
Hover over an electron to see its quantum numbers (n, l, mₗ, mₛ)
● Proton
● Neutron
(nucleus scaled for visibility)
Electron Shells & Orbitals 2n² rule · Pauli exclusion · Hund's rule
How electrons fill shells, subshells, and orbitals
Origins of the Elements From Big Bang to Supernovae
Where did the atoms in your body come from?
Element Stories Discovery history and fun science
Click any card to expand the full story
Quiz Mode Test your chemistry knowledge
Choose a quiz type to begin
Difficulty:
Chemical Reactions Common reaction types and equations
Key equations every chemistry student should know
Competition Prep Key topics for chemistry competitions
Essential concepts for olympiad and advanced exams
🧪 Home Experiments Safe · Math-connected · Do it yourself
Chemistry is algebra in disguise — every reaction is an equation you can solve.