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History of atomic theory

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. Initially, it referred to a hypothetical fundamental particle of matter, too small to be seen by the naked eye, that could not be divided. Then the definition was…

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Overview

Pre-atomic chemistry

Dalton's chemical atomism

Opposition to atomic theory

Prout's hypothesis

Vortex theory

Isomerism

Mendeleev's periodic table

Kinetic theory of gases

Plum pudding model

Planetary models

Haas atomic model

Nicholson atom theory

Discovery of the nucleus

Discovery of isotopes

Atomic number

Bohr model

Discovery of the proton

Quantum mechanical models

Discovery of the neutron

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History of atomic theory

Nodes193
Edges192
Triples10
Avg. degree1.99
Density0.010363
Components1

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Important terminology

atomic atom atoms model hydrogen electrons elements particles charge theory could chemical electron rutherford would weight thomson number mass nucleus

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
temperatureinstance ofwas a particle that cannot be divided by physical means0.80text
pressureinstance ofwas a particle that cannot be divided by physical means0.80text
and ainstance ofwas a particle that cannot be divided by physical means0.80text
magnetisminstance ofits own advocates eventually concluded that the vortices were not stable and furthermore the theory offered no account of phenomena0.80text
gravitationinstance ofits own advocates eventually concluded that the vortices were not stable and furthermore the theory offered no account of phenomena0.80text
emission spectra.In 1910instance ofit could not predict any of the known properties of the atom0.80text
Robert Ainstance ofit could not predict any of the known properties of the atom0.80text
radiuminstance ofthese are positively-charged particles emitted by certain radioactive substances0.80text
electronsinstance ofparticularly subatomic particles0.80text
the hydrogen molecular ioninstance ofAnalytic solutions of the Schrödinger equation are known for the hydrogen atom and hydrogen-like atoms0.80text

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