Who Revised the Atomic Theory?


Jane Flores

The Atomic Theory is one of the most fundamental concepts in modern science. It describes the nature of matter, how it behaves and interacts with other matter.

The theory has undergone several revisions throughout history, with each revision building upon the previous one. In this article, we will explore who revised the Atomic Theory and what changes they made to it.

John Dalton

The first person to propose a modern Atomic Theory was John Dalton, an English chemist, and physicist. In 1803, he proposed that all matter was composed of atoms that were indivisible and indestructible. He also suggested that each element had its unique type of atom, which differed in mass and size from other elements.

J.J Thomson

In 1897, J.J Thomson discovered the electron, which proved that atoms were not indivisible as Dalton had thought. He proposed a new model known as the Plum Pudding Model or Thomson’s Atomic Model. According to this model, atoms were composed of positively charged material with negatively charged electrons embedded within them.

Ernest Rutherford

In 1911, Ernest Rutherford conducted an experiment known as the Gold Foil Experiment. He fired alpha particles at a thin sheet of gold foil and observed their behavior. Based on his observations, he proposed a new atomic model where atoms had a small positively charged nucleus at their center surrounded by negatively charged electrons orbiting around it.

Niels Bohr

Niels Bohr further refined Rutherford’s model in 1913 by proposing that electrons moved in fixed orbits around the nucleus instead of randomly moving around it. He also introduced the concept of energy levels or shells where electrons could exist at specific distances from the nucleus.

James Chadwick

James Chadwick discovered neutrons in 1932 and showed that they were a fundamental part of the atomic structure. He proposed that atoms had a small, dense nucleus containing positively charged protons and neutral neutrons with negatively charged electrons orbiting around it.


In conclusion, the Atomic Theory has undergone several revisions over the years, with each revision building upon the previous one. John Dalton proposed the first modern Atomic Theory, J.J Thomson discovered the electron, Ernest Rutherford proposed the nuclear model of an atom, Niels Bohr introduced energy levels or shells and James Chadwick discovered neutrons.

These scientists have contributed significantly to our understanding of matter and its behavior. Today, we continue to refine and improve upon their work as we strive to unravel the mysteries of the universe.