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Theories on Atomic Structure - Coggle Diagram
Theories on Atomic Structure
Dalton's Atomic Theory
Created in 1808 by John Dalton
Stated that matter are made of small indivisible particles called atoms
Also stated that all atoms of one element are identical, and atoms differ depending on the element
JJ Thomson's Theory
Joseph J Thomson proposed this ¨plum pudding¨ theory on atoms after the electron was discovered
Stated that atoms are consisted of a positively charged sphere with negatively charged electrons scattered within the sphere, like fruit in a plum pudding
Stated that the charge of the positively charged sphere is equal to the negative charge of the electrons
Rutherford's Hypothesis
Proposed the idea of the nucleus
Discovered the movement of the electrons and protons in the atom
Proposed that there are an equal amount of electrons and protons in every atom
Hypothesized that neutral particles that aren't electrons or protons exist
Bohr's Theory
Proposed the Bohr atomic model in 1915
Proposed the idea of electron shells around the nucleus
Stated that electrons orbit the nucleus in electron shells that each have a set size and energy level
Stated that radiation can occur when electrons move between shells
Ancient Greek Beliefs
First proposed by Leucippus and Democritus in the 5th century BC
Stated that all matter was made of tiny units called atoms
Said that atoms were a solid particle without internal structure
Also stated that things like color and taste were made of atoms
Quark Theory
Stated how protons and neutrons were made of even smaller particles
The smaller particles were called quarks
Proposed that protons and neutrons are made of three different quarks each