Summary of Atomic Structure and Electron Behavior

Atomic Structure and Electron Behavior

• Early 1900s: Discovery of subatomic particles initiated the quest to understand atomic structure.

• Rutherford's Model:

  • Proposed that positive charge and most mass of an atom are concentrated in a nucleus.

  • Nucleus is surrounded by fast-moving electrons.

  • Questions arise on why negatively charged electrons do not spiral into the nucleus.

Electromagnetic Radiation

• Electrons inside atoms cause the emission of light and electromagnetic radiation through their motion.

• Electron Behavior:

  • Electrons exhibit wave-like behavior, affecting radiation emission.

  • Wiggling charges generate radiation; frequency of wiggling relates to wavelength.

Electron Excitation and Light Emission

• Heating metal samples excites electrons, moving them to higher energy levels.

• As electrons return to lower energy levels (ground state), they emit energy as visible light, producing colors specific to each metal.

Niels Bohr's Atomic Model (1915)

• Proposed fixed orbits for electrons around the nucleus.

  • Ground State: Lowest energy state of an electron.

  • Excited State: Higher energy level achieved when energy is absorbed.

• Smaller orbits correspond to lower energy levels; energy removal causes electrons to emit light as they return to the ground state.

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