Atomic Timeline
Category: Other
Updated: 1 Nov 2022
Contributors
Created byJULIA CHUNG
Attachments
Events
Democritus - Theorized all materials are made up of atomsDalton - Introduced Atomic TheoryThomson - Discovered the electron
Electron - Subatomic particle with a negative charge, found in all atomsRutherford - Discover's the nucleus of an atomChadwick - Discovered the neutron
Neutron - Subatomic particle with no electric charge, found in almost all atomic nucleiGoeppert-Mayer - Developed a model for the structure of nuclear shellsLise Meitner - Discovered nuclear fissionDiscontinuous theory of matter - Democritus discovered matter was finite, not limitlessElectron cloud theory - It cannot be known exactly where an electron is at any given time, but the electrons are more likely to be in specific areasUncertainty principle - It cannot be known both the position and speed of a particle, such as a photon or electron, with perfect accuracy; the more is nailed down the particle's position, the less is known about its speed and vice versaQuantum theory - "A theory of matter and energy based on the concept of quanta, especially quantum mechanics"Plum pudding model - depicts electrons as negatively charged particles embedded in a sea of positive chargeProton - Subatomic particle with a positive charge, found in all atomic nucleiPhoton - "a particle representing a quantum of light or other electromagnetic radiation"Quark - "any of a number of subatomic particles carrying a fractional electric charge"Robert Millikan - Discovered the elementary charge of an electronLavoisier - "Defined that matter was composed of atoms that were not created or destroyed during chemical reactions"Coulomb - Created a law that states: "the electric force between charged objects inversely depends upon the distance between the objects"
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