Science · Atoms and Elements
Build an Atom
Build atoms by dragging protons, neutrons and electrons. Choose a mode to begin.
Choose what to explore
Choose a mode
Explore atomic structure, read element symbols, or test your skills in the Game.
Build the atom
Atom builder
Drag a particle into the atom, or use Tab and Enter.
Atom
— No element Add protons to begin Stable
Protons
10 left
Neutrons
13 left
Electrons
10 left
Atomic number (Z)0
Mass number (A)0
Net charge0
NucleusStable
Choose a simulation mode to begin.