Early Theories of Matter
The Birth of the Atom
Atomistic Theory
Leucippus and Democritus
Aristotle's Elements
Robert Boyle: Mighty Chemist
The Emergence of Modern Chemistry
Big Chem Historical Introduction
Who was John Dalton
Dalton's Atomic Theory
Modern Theories of Matter
Joseph John Thomson
Investigating the Properties of Electrons
The Nuclear Atomic Model
Ernest Rutherford
Niels Bohr: The Old Quantum Theory
The Bohr Model
A World of Particles
How Atoms Work
Drawing Atomic Diagrams
Atomic Theory
The Modern View of Atomic Structure
Structure!
Gratuitous Atomic Diagrams
David's Whizzy Periodic Table
The Elements
Chemical Elements.com
Bohr Diagrams for the First 20 Elements
Atom Builder
Lewis Dot Diagrams
Calculating Average Atomic Mass
Calculating Average Atomic Mass
Ask Dr. Mass
Isotopes
The Mass Spectra of the Elements
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