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Theories on Atomic Structure - Coggle Diagram
Theories on Atomic Structure
Dalton's atomic theory
John Dalton
it does not account for subatomic particles daltons theory stated the atoms were invisible but subatomic particles such as protons electrons and neutrons disprove this postulate.
the strong points are all matter is made up of atoms the second one is all atoms of a given elements are identical in mas and properties
Ernest Rutherford
the atom is mostly empty space , with nearly all of its mass concentrated in a tiny centrral nucleus
the negatively charged electrons surround the nucleus of an atom.
Most of the alpha particle passed straight through the foil without any deflection from their path.
A small fraction of them were deflected from their original path by small angles.
J.J Thompson's Theory
Proponents - William Thompson and Joseph Thompson
Strong Points - Strong Points - It successfully explained electron neutrality of an atom
Model -
Weak Points - Failed to explain the results of the alpha particle scattering experiment
Bohr's Theory
Proponents - Niels Bohr and Ernest Ruthford
Model -
Strong Points -
Explained stability of an atom by quantizing angular momentum
Explained discretes spectra of Hydrogen
Explains we can calculate energy of nth orbit
Weak Points -
Fails to explain the effect of magnetic field on the spectra of atoms
Failed to explain the Stark effect
Failed to explain Heisenberg Uncertainty Principle
Ancient Greek Beliefs
Democritus
Atom - Development, Theory, Structure | Britannica
The atomic philosophy of the early Greeks
Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped.
