Atomic models of the past
Daltons Atomic Theory
Dalton's atomic theory was proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
Democritus Model Theory
All matter consists of invisible particles called atoms, Atoms are indestructible, Atoms are solid but invisible, Atoms are homogenous, Atoms differ in size, shape, mass, position, and arrangement, Solids are made of small, pointy atoms, Liquids are made of large, round atoms, Oils are made of very fine, small atoms that can easily slip past each other.
The Plum Pudding Model was a model of the atom that incorporated the recently discovered electron, and was proposed by J. J. Thomson in 1904, it was also known as J J Thomson's Atomic Model. Thomson had discovered the electron in 1897. The plum pudding model was abandoned after discovery of the atomic nucleus.
In 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus. In atomic physics the Rutherford Bohr model or (Bohr model). It was introduced by Neilz Bohr in 1913.