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Thomson atomic model. atomic model, in physics, a model used to describe the structure and makeup of an atom. Atomic models have gone through many changes over time, evolving as necessary to fit experimental data. For a more in-depth discussion of the history of atomic models, see atom: development of atomic theory.
Oct 13, 2016 · This graphic takes a look at the key models proposed for the atom, and how they changed over time. Though our graphic starts in the 1800s, the idea of atoms was around long before. In fact, we have to go all the way back to Ancient Greece to find its genesis. The word ‘atom’ actually comes from Ancient Greek and roughly translates as ...
Democritus' Model. Democritus was an ancient philosopher who lived around 400 BC. He developed the first atomic model. Democritus asserted that matter is made up of very small particles that cannot be broken or divided. He called these particles atoms (atomos in Greek, which means indivisible).
The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific discoveries.
atomic theory, ancient philosophical speculation that all things can be accounted for by innumerable combinations of hard, small, indivisible particles (called atoms) of various sizes but of the same basic material; or the modern scientific theory of matter according to which the chemical elements that combine to form the great variety of ...
- The Editors of Encyclopaedia Britannica
Oct 8, 2024 · Atom - Development, Theory, Structure: The concept of the atom that Western scientists accepted in broad outline from the 1600s until about 1900 originated with Greek philosophers in the 5th century bce. Their speculation about a hard, indivisible fundamental particle of nature was replaced slowly by a scientific theory supported by experiment and mathematical deduction. It was more than 2,000 ...
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Nov 13, 2018 · Atomic theory is a conceptual framework that describes the fundamental nature of matter at the smallest level. It proposes that matter is composed of basic units called atoms, which are the smallest and indivisible units of a chemical element. The theory of the atom provides a model for understanding the structure and behavior of atoms, as well ...
