History of Atomic Theory

Aristotle believes that each atom is composed of its own elements. The four elements are the earth, the wind, the fire, and the water.

Democritus's theory states that everything consists of atoms. He said atom is indivisible

Dalton said all the substances are composed of individual particles called atoms. He imagined that the atom was a solid sphere

Mr. Schroding noted that electrons can not be located correctly, but they may use tracks to find possible locations.

Nagaoka is a Japanese physicist who insists that atoms contain nuclei. He made lots of models before Bohr.

Rutherford discovered that atoms contain nuclei. He used high power alpha particles in gold leaf experiments to discover this.

The Bohrs model states that electrons move in a circle at a certain distance from the core filled with protons.

Chadwick proved the existence of neutrons. Neutrons have no charge and form nuclei with protons.

De Broglie suggested that in 1924 the electrons have similar fluctuations. A few years later, more evidence proved to prove his hypothesis

Heisenberg introduced uncertainty in atomism theory. He said that the position of the electron can not be pinpointed exactly.

Albert Einstein is definitely one of the two biggest physicists in history. Only after Einstein's 1905 paper showed that the discrete nature of atoms explains the Brownian movement, atomism was accepted. In another article of 1905, the famous equation E = mc 2 was introduced, but Einstein published other papers in the same year. It is no wonder that physicists will talk about the years of miracles without Einstein 's miraculous year qualification! (Prior to his miracle year, Einstein was an ordinary undergraduate and worked as a small expert, including a patent examiner.) Einstein published at least 300 papers on books and physics. For example, in a 1917 paper he predicts the principle of laser. He became a very famous and influential celebrity. (For example, it was his letter that Roosevelt launched the Manhattan plan.)

The history of atomic structure and quantum mechanics can be traced back to the era of Democritus, Democritus first suggested that the material be composed of atoms. Due to the lack of technology, these theories are not that important. John Dalton's atomic theory is a foothold to revitalize the concept of atoms. For a long time people thought that atoms were the last particle of matter. In the late nineteenth and early twentieth century experiments, even atoms were found to be not final particles. The constant efforts of scientists has led to the discovery of elementary particles. The Dalton atomic model explains the limits of certain observations and builds the foundation for the discovery of electrons and protons. Further investigation revealed the existence of neutrons. The atomic composition is called subatomic particle. Let's explain each elementary particle discovery one by one.

Atomic theory has been revised over the years to incorporate the existence of atomic isotopes and the interconversion of mass and energy. In addition, the discovery of subatomic particles suggests that atoms can be divided into smaller parts. However, the importance of Dalton in the development of modern atomism theory is that Dalton's