![]() ![]() The atom now consisted of a positive nucleus with negative electrons in circular orbits around it. The nuclear model replaced the plum pudding model. The small positive nucleus would deflect the few particles that came close. His model explained why most of the α particles passed straight through the foil. ![]() J J Thomson thought of the atom as being a positively charged mass embedded with small negatively charged electrons a bit like a plum pudding. The atom was thought to consist of negatively charged electrons (the ‘plums’) in a positively charged ‘dough’ or ‘pudding’. The electrons revolve in circular orbits about a massive positive charge at the centre. This led him to suggest the plum pudding model of the atom. Thompson proposed the Plum Pudding model. Rutherford proposed that the atom is mostly empty space. Others soon called it electron, despite Thomsons stubborn preference for his original term, borrowed from Robert Boyle (162791) to denote any particlelike structure. The symmetrical distribution of charge would allow all the α particles to pass through with no deflection. In 1897, Joseph John Thomson (18561940) had announced the discovery of a corpuscle. He argued that the plum pudding model was incorrect. Some scattered in various directions, and a few were even deflected back towards the source. When Rutherford shot α particles through gold foil, he found that most of the particles went through. So think of the model as a spherical Christmas cake. Rutherford’s Experiment In the early 1900’s, the plum pudding model was the accepted model of the atom. , Summarize Dalton's atomic theory., Compare and contrast Thomson's plum pudding atomic model with Rutherford's nuclear atomic model. Thomson's plum pudding model viewed the atom as a massive blob of positive charge dotted with negative charges.Ī plum pudding was a Christmas cake studded with raisins ("plums"). Study with Quizlet and memorize flashcards containing terms like Define an atom. ![]()
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