In 1911, Ernest Rutherford proposed a model of the atom in which a very small, dense and positively charged nucleus of protons was surrounded by orbiting, negatively charged electrons (the Rutherford model).
I 1911 foreslog Ernest Rutherford en model for atomet i hvilke en meget lille, tæt og positivt ladet kerne af protoner ( neutronen var endnu ikke opdaget) var omgivet af kredsende, negativt ladede elektroner ( Rutherfords model).