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Period: to
Atomic Theory Years
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Dalton Atomic Theory
In 1803 Dalton came up with atomic theory it stated..
1. All matter is made up of atoms. Atoms are indivisible and indestructible.
2. All atoms of a given element are identical in mass and properties.
3. Compounds are formed by a combination of two or more differnet kinds of atoms.
4. A chemical reaction is a rearrangement of atoms. -
J.J. Thopmson Atomic Theory
J.J. Thompson discovered the electron in a series of experiments designed to study the nature of electric discharge in a high volume-vacuum cathode-ray tube. -
J.J. Thompson Atomic Theory 2
J.J. Thompson in 1904, suggested that a model of the atom as a sphere of positive matter in which the electros are positioned by electrostatic forces. -
Rutherford Atomic Theory
Rutherford in 1911 said an atom has a central positive nucleus surrounded by having negative orbiting electrons. Suggesting that most of the mass of an atom was contained in the small nucleus and the rest of the atom was mostly empty space. -
Bohr Atomic Theory
Bohr determined that the atom is made of a central positive nucleus containing protons(positively charged) and neutrons( neutral charge). The electrons( negatively charged) revolved around the nucleus in different imagenary paths called orbitss or shells. -
Heisenberg/ Schrodinger Atomic Theory
The modern model for atomic theory is based off of electrons moving in a wave around the nucleus. A wave rather than a particle, the postition and the momentum of an electron can't be precisely calculated because of this, it is called the uncertainty principle. -
Chadwick Atomic Theory
Chadwick discovered the neutron, atoms contained neutral particles called neutrons in their nucleus along with subatomic particles( electrons and protrons).
