1932
To Present
1913
1911
1897
1808
The atomic model describes atoms as solid, indivisible spheres. Atoms of the same element are identical, and chemical reactions involve their rearrangement without creation or destruction.
The atomic model proposed that atoms consist of a sphere of positive charge with electrons scattered within, balancing the overall charge. This introduced the concept of subatomic particles.
Atomic model describes atoms with a small, dense, positively charged nucleus surrounded by electrons in orbit, with most of the atom being empty space.
Atomic model discovered the neutron (neutral particle) in the nucleus alongside protons. This explained the missing mass in atoms and refined the atomic model by showing that the nucleus contains protons and neutrons, while electrons orbit around it.
The modern atomic model has a nucleus made of protons and neutrons, with electrons in regions called orbitals around it. Instead of fixed orbits, electrons are described by probabilities of where they may be found.
The atomic model describes an atom as having electrons orbiting the nucleus in fixed energy levels, like layers of an onion. Electrons can move between these layers by gaining or losing energy.
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JJ Thomson Model, 1897
Ernest Rutherford Model, 1911
The Modern Model, To The Present
Niels Bohr Model, 1913
John Dalton Model, 1808
James Chadwick Model, 1932
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