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Date of Discovery: 430 B. C. E.
Name of Atomic Model: Atomos

- Democritus proposed that matter could not be divided into smaller pieces forever. He made that matter was made of small hard particles that he called Atomos.

References:

https://www.britannica.com/science/atom/Development-of-atomic-theory
https://sites.google.com/site/mrjhatomichistory/democritus

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Date of Discovery: 1803
Name of Atomic Model: Solid Sphere Model

- In 1803 John Dalton has found that all matter consists of atoms, tiny indivisible particles that cannot be created and destroyed. Atoms of one element cannot be converted into atoms of another element, they have identical mass and other properties.

References:
https://www.britannica.com/biography/John-Dalton

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Date of Discovery: April 30, 1897
Name of Atomic Model: Plum Pudding Model

- Thomson had discovered an electron from cathode experiment, he observed an electron travel in a straight line. He also found out that an electron is negatively charged and possesses mass.

References:
http://t3.gstatic.com/licensed-image?q=tbn:ANd9GcRpPH8AxsaANr4jXbirHmwHCjKt_KW7UXuYmW7WonoImNQnOSpSKrSd4XW68EaE

https://www.history.com/this-day-in-history/jj-thomson-announces-discovery-of-electrons

https://www.biography.com/scientist/jj-thomson

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Date of Discovery: 1911
Name of Atomic Model: Nuclear Model

- Rutherford discovered protons and the nucleus, he showed that atoms have positive particles in the center and mostly empty space.

References:

https://edukalife.blogspot.com/2015/06/biography-of-ernest-rutherford-british.html

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Date of Discovery: 1913
Name of Atomic Model: Bohr Atomic Model

- Niels Bohr proposed a theory for the hydrogen atom in 1913, based on quantum theory which states that some physical quantities have only discrete values. Electrons circulate around a nucleus in predetermined orbits, and if they leap to a lower-energy orbit. The energy difference is radiated.

References:

https://www.nobelprize.org/prizes/physics/1922/bohr/facts/

http://abyss.uoregon.edu/~js/glossary/bohr_atom.html
http://scihi.org/niels-bohr-quantum-mechanics/

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Date of Discovery: 1926
Name of Atomic Model: Quantum Model

- The exact location of the electron Erwin Schrödinger found that the electrons do not move around the nucleus in an orbit but in the cloud where their position is uncertain. His theory is still widely accepted as the most accurate model of atoms.

References:
https://www.geniuses.club/genius/erwin-schrodinger

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Date of Discovery: 1932
Name of Atomic Model: The Neutron

- The neutron was discovered by James Chadwick in 1932, and he is well known for it. A neutron is a neutral particle that makes up the nucleus of an atom along with positively charged protons. Chadwick's studies were important in the discovery of nuclear fission and, ultimately the development of the atomic bomb.

References:

https://www.atomicheritage.org/profile/james-chadwick

https://www.nobelprize.org/prizes/physics/1935/chadwick/biographical/

https://todayinsci.com/C/Chadwick_James/ChadwickJames-Quotations.htm