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Timeline
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Dalton's Solid Sphere Model
The Solid Sphere model is an atomic model proposed by John Dalton in 1803. It states that all objects are made of particles called atoms and that they are solid spheres that cannot be divided further into smaller particles. -
Thompson: The Plum Pudding Model
In 1904, J.J. Thompson created the Plum Pudding Model. In the model of the atom, the electrons were embedded in a uniform sphere of positive charge. -
Rutherford: The Nuclear Model
Ernest Rutherford created The Nuclear Model in 1911. The model described the atom as a tiny, dense, positively charged core called a nucleus. -
Bohr: The Bohr (Planetary) Model
Niels Bohr made The Bohr (Planetary) Model in 1913. In the Bohr model, the electrons travel in defined circular orbits around the small positively-charged nucleus. The Bohr Model is known as a planetary model because these orbits look similar to that of planets orbiting the sun. -
Schrodinger: Quantum Mechanics Model
In 1926, Erwin Schrödinger created the Quantum Mechanics Model. Schrödinger combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.