FHSST Physics/Atom/Models

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The Free High School Science Texts: A Textbook for High School Students Studying Physics
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The Atom
Models - Structure - Isotopes - Energy Quantization - Periodicity of Ionization Energy - Successive Ionization Energies - Bohr Orbits - Heisenberg Uncertainty Principle - Pauli Exclusion Principle - Ionization Energy - Electron Configuration - Valency

Models of the Atom[edit]

Atom
Model of the atom - 3-D Helium atom - ground state
Helium atom model
Showing nucleus with two protons (blue)
and two neutrons (red),
orbited by two electrons (waves).
Classification
Smallest recognised division of a chemical element
Properties
Mass: ≈ 1.66 × 10^-27 to 4.52 × 10^-25 kg
Electric charge: zero
Diameter: 10 pm to 100 pm
See Also
A New Model of the Atom for an alternate view of how to understand atomic structure.