Build an Atom
Drag particles from the tray below into the atom. Protons and neutrons go in the nucleus. Electrons go on the shell rings.
AQA: All atoms have a nucleus containing protons (charge +1, mass 1) and neutrons (charge 0, mass 1), surrounded by electrons (charge −1, negligible mass) in shells. Atomic number Z = proton count. Mass number A = protons + neutrons.