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Dalton Model
John Dalton thougth that all of the elements are full of atoms that are all the same. He believed that each element had atoms of all sizes and weight. John Dalton thought of atoms as if they were "tiny, solid balls." -
Thomson Model
J.J. Thomson was the first person to discover the electron. He believed "that an atom is a positively charged sphere with electrons embedded in it." People thought of his newely discovered "model" as being a berry and raisin muffin. -
Nagaoka Model
Hantaro Nagaoka thought of a new model of an atom. He came up with an atom with a large circle in the middle with a positive charge. People think of his model as planets moving around the sun, because his newely created model had electrons circling around the circle or sphere in the center of the atom. -
Rutherford Model
Ernest Rutherford believed that an atom is basically made up of empty space. "Electrons orbit randomly around a small, positively charged nucleus." -
Bohr Model
Niels Bohr thought of a new type of atom model that had different parts of electrons moving in a certain way, versus the electrons moving everywhere and anywhere. Niels Bohr said, "Atoms absorb or give off energy when the electrons move from one shell to another." -
The Present Modern Model
The newest atomic model that we use in this time period of the 20th Century, has been evolving from the 1920's till now. "Electrons form a negatively charged cloud around the nucleus. It is impossible to determine exactly where an electron is at a given time."
