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Dalton Model
John Dalton, a British chemists, published a New System of Chemical Philosophy. It explaines that each elements that are small and that differnet elements have atoms of different mass. Dalton imagined the atoms as tiny, solid balls. -
Thomson Model
J.J Thomson was a British Scientist. He proposed a model, which was an atom, a postively charged sphere with electrons inside it. His model was descibed as looking like a muffin with berries scattered through it. -
Nagaoka Model
Hantaro Nagaoka, a Japanese physicist, proposed a model of a atom in 1904. He said that the atom had a large sphere (the nucleus) in the center, with positive charge. His model showed the electrons revolving around this sphere, just like the planets around the plantes around the sun. -
Rutherford Model
Ernest Rutherford, a British physicist, concluded that the atom is mostly empty space and electrons orbit randomly around a small, positively charged nucleus. -
Bohr Model
Niels Bohr, a Danish physicist, discovered that electrons aren't randomly located around the nucleus, but that they are moving in specific layers, or shells. He said that atoms absorb or give off energy when electrons move from one layer to the other. -
Modern Model
In the 1920s, many scientists created the current model of the atom. The atom shows the electrons as forming a negatively charged cloud around the nucleus. They said that it is impossible to determine exactly where an electron is at any given time. -
Chadwick Model
James Chadwick, a British physicist, discovered the neutron. It is a particle having about the same mass as the protron, but with no electrical charge. Once James discovered the neutron, it was clear why atoms were heaveir than the total mass of their protons and elctrons.
