History of the Atoms By cookie1 Jan 1, 1000 Democritus Atoms are indivisible Jan 1, 1803 Dalton Atoms are indivisable Jan 1, 1897 Thomson Atoms have electrons Jan 1, 1911 Rutherford Atoms have electrons and a nucleus Jan 1, 1922 Bohr Atoms have electrons and a nucleus and orbit Period: Jan 1, 2000 to Feb 16, 2012 History of the Atoms Feb 16, 2012 Wave Atoms have electrons and a nucleus and a electron cloud