By: Lizzy Edwards
John Dalton's Model of the Atom... (1803)
1. Elements are made of extremely small particles called atoms.
2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
J.J. Thomson's Model of the Atom... (1897)
Hantaro Nagaoka's Model of the Atom... (1904)
- Nagaoka's model made two predictions:
1. A very massive atomic center (in analogy to a very massive planet)
2. Electrons revolving around the nucleus, bound by electrostatic forces (in analogy to the rings revolving around Saturn, bound by gravitational forces).
Ernest Rutherford's Model of the Atom... (1911)
Louis de Broglie's Model of the Atom... (1924)
Erwin Schrodinger's Model of the Atom... (1926)
1. Electrons occupy only certain orbits around the nucleus. Those orbits are stable and called "stationary" orbits.
2. Each orbit has an energy associated with it. The orbit nearest the nucleus has an energy of E1, the next orbit E2, etc.
3. Energy is absorbed when an electron jumps from a lower orbit to a higher one and energy is emitted when an electron falls from a higher orbit to a lower orbit.
4. The energy and frequency of light emitted or absorbed can be calculated by using the difference between the two orbital energies.