Write a paragraph giving your thoughts about the webpage. Ernest Rutherford British physicist who, in 1908, proved the atom had a small, dense, positively charged nucleus. Rutherford's model proposed that an atom is mostly empty space. There is a small, positive nucleus with the negative electrons scattered around the outside edge. Niels Bohr Danish scientist who, in 1913, proposed the Planetary Model of the atom.
Electrons move in definite orbits around the nucleus, like planets moving around the nucleus.
Bohr proposed that each electron moves in a specific energy level. Sir James Chadwick discovered the neutron in 1935. Based on wave mechanics, this model proposes that electrons have NO definite path in an atom. The probable location of an electron is based on how much energy it has. The more energy an electron has, the farther from the nucleus.