Thomson plum pudding model
E656398
The Thomson plum pudding model was an early atomic theory proposing that negatively charged electrons were embedded within a diffuse, positively charged "pudding" that made up most of the atom.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
atomic model
ⓘ
historical scientific theory ⓘ |
| alsoKnownAs |
Thomson atomic model
NERFINISHED
ⓘ
plum pudding model NERFINISHED ⓘ |
| appliesTo | all atoms ⓘ |
| assumes |
atom is a sphere of positive charge
ⓘ
electrons are much lighter than the positive matrix ⓘ electrons are stationary or slowly moving within the positive matrix ⓘ electrons can move within the positive sphere ⓘ mass of atom is largely associated with positive charge distribution ⓘ negative electrons are embedded in a diffuse positive charge ⓘ no central nucleus ⓘ overall atom is electrically neutral ⓘ positive charge is spread out continuously ⓘ positive charge occupies most of atomic volume ⓘ |
| basedOn | discovery of the electron ⓘ |
| cannotExplain |
discrete atomic spectra
ⓘ
existence of a small dense nucleus ⓘ large-angle scattering of alpha particles ⓘ |
| challengedBy | Rutherford gold foil experiment NERFINISHED ⓘ |
| comparesElectronsTo | plums in a pudding ⓘ |
| comparesPositiveChargeTo | pudding ⓘ |
| describes | structure of the atom ⓘ |
| educationalLevel |
high school physics
ⓘ
introductory university physics ⓘ |
| electronDiscoveredBy | J. J. Thomson NERFINISHED ⓘ |
| electronDiscoveryYear | 1897 ⓘ |
| falsifiedBy | alpha particle scattering experiments ⓘ |
| field |
atomic physics
ⓘ
physical chemistry ⓘ |
| historicalPeriod | early 20th century ⓘ |
| illustrates | transition from indivisible atoms to subatomic structure ⓘ |
| influenced | development of later atomic models ⓘ |
| languageOfOriginalPublication | English ⓘ |
| precedes | Rutherford nuclear model NERFINISHED ⓘ |
| predicts | small deflections of alpha particles only ⓘ |
| proposedBy | J. J. Thomson NERFINISHED ⓘ |
| proposedInYear | 1904 ⓘ |
| relatedConcept |
cathode rays
ⓘ
electron ⓘ nuclear atom ⓘ |
| replacedPreviousViewOf | indivisible solid atom of Dalton ⓘ |
| status | superseded ⓘ |
| supersededBy |
Bohr model of the atom
NERFINISHED
ⓘ
Rutherford model of the atom NERFINISHED ⓘ |
| usedAs | teaching example in history of science ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.