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Not based on these old concepts
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- Modern atomic theory is not based on these old concepts. In the early 19th century, the scientist John Dalton noticed that chemical substances seemed to combine with each other by discrete and consistent units of weight, and he decided to use the word atom to refer to these units.
en.wikipedia.org/wiki/History_of_atomic_theory
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Aug 26, 2020 · Dalton’s ideas are called the modern atomic theory because the concept of atoms is very old. The Greek philosophers Leucippus and Democritus originally introduced atomic concepts in the fifth century BC.
The Modern Atomic Model takes into account the wave-like behavior of electrons and their probability distributions within the atom, while the Old Model only described electrons as orbiting the nucleus in fixed, circular paths.
The modern atomic theory establishes the concepts of atoms and how they compose matter. Atoms consist of negatively charged electrons around a central nucleus composed of more massive positively charged protons and electrically neutral neutrons.
Modern atomic theory is not based on these old concepts. [ 2 ] [ 3 ] In the early 19th century, the scientist John Dalton noticed that chemical substances seemed to combine with each other by discrete and consistent units of weight, and he decided to use the word atom to refer to these units.
Nov 13, 2018 · Mid-20th Century: The Modern Atomic Model. In the second half of the 20th century, the modern atomic model was established. Based on quantum mechanics, it describes the positions of electrons in terms of probabilities.
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.
Atomism - Modern Theory, Particles, Structure: With the development of a scientific atomic theory, the general philosophical problems gradually disappeared into the background. All attention is focused on the explanation of concrete phenomena.
