atomic theories and models
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This document discusses the history of atomic theory and models from ancient Greek philosophers to modern physics. Democritus first proposed that matter was made of indivisible particles called atoms. He believed atoms were different shapes and sizes and made of the same material. Later models include Dalton's model of atoms, Thomson's raisin bun model, Rutherford's planetary model, Bohr's nuclear model, and the modern quantum mechanical model where electrons exist as probability clouds rather than definite orbits.
atomic theories and models
- 1. Atomic Theory and Models Jeri Mayah P. Asuncion BEED 1-3 DAY
- 2. Democritus He asked: Could matter be divided into smaller and smaller pieces forever, or was there a limit to the number of times a piece of matter could be divided?
- 3. Atomos His theory: Matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained.
- 4. Atomos To Democritus, atoms were small, hard particles that were all made of the same material but were different shapes and sizes.
- 5. The eminentThe eminent philosophersphilosophers of the time,of the time, AristotleAristotle andand PlatoPlato, had a, had a moremore respected,respected, theory.theory.
- 7. Thomson’s Model Raisin Bun Model
- 10. Bohr's Model
- 12. The Modern Model Today’s atomic model is based on the principles of wave mechanics. According to the theory of wave mechanics, electrons do not move about an atom in a definite path, like the planets around the sun.
- 13. Electron Cloud: A space in which electrons are likely to be found. Electrons whirl about the nucleus billions of times in one second They are not moving around in random patterns. Location of electrons depends upon how much energy the electron has.