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Discovery of the First Element
PhosphorusA Brief History of the Development of Periodic Table Hennig Brand discovers the first element, Phospherous. -
Coulomb's Law
History of Chemistry
Charles Coulomb discovered that when two particals that are seperated, their forces are directly proportional to the product of both of the charges. -
Dalton's Atomic Theory
History of Chemistry Atomic Theory, which says that matter is made up of atoms that are small and invisible, is published by John Dalton. -
Dalton's Atom
Dalton's Atomic TheoryDeveloping The Atomic Theory of Matter
Dalton's idea of an atom was tiny, invisible, and indestructible -
First Publication of the Periodic Table
The Background of the Development of Periodic Table The first periodic table was published in 1862 by French geologist A.E. Beguyer de Chancourtois. -
Discovery of the Noble Gases
A Brief History of the Development of Periodic Table Founded by Lord Rayleigh, the first discovered noble gas was argon. It did not fit any known periodic group. -
Thomson's Atom
Joseph John ThomsonChapter I - ATOM
British physicist, Thomson discovered a new part of the atom, known as electrons. -
Rutherford's Atom
Rutherford's Planetary Model of the AtomAtom Model
Rutherford theorized that the mass of the atom was concentrated in the nucleus, and the alpha, or positive, particals could be deflected backwards. -
Bohr's Atom
The Refined Bohr Model
Appling quatum theory to Rutherford's atomic structure, Bohr assumed electrons travel in stationary orbits that are defined by angular momentum,
