3 dic 1911 año - Ernest Rutherford: The Rutherford model He proposed a model of the atom which suggests that the atom contained a positively charged nucleus which was surrounded by small negatively charged elections. He came to this conclusion from directing the famous Geiger- Marsden experiment which is also known as the gold leaf experiment. Alpha rays were aimed at gold leaf but instead of passing through it, it was repelled or emerged at different angles. (Cinta de tiempo)