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Electrons

Electrons. Negative charge e- Located in the electron cloud far from the nucleus Have mass, but it is negligible Also have wave-like properties. Bohr Model of the atom. Bohr model: e- move in fixed orbits around the nucleus. Wave-Mechanical Model of the atom.

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Electrons

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  1. Electrons • Negative charge e- • Located in the electron cloud far from the nucleus • Have mass, but it is negligible • Also have wave-like properties

  2. Bohr Model of the atom • Bohr model: e- move in fixed orbits around the nucleus

  3. Wave-Mechanical Model of the atom • Wave-mechanical model: e- move in areas called orbitals • An orbital is a region where an e- is likely to be found

  4. Electrons have ElectronS in their lowest possible energy state are in the ENERGY GROUND STATE

  5. ElectronS in a HIGHER possible energy state are in the EXCITED STATE

  6. Excited State e- Ground State

  7. For an e- to jump from the ground state to the excited state, it must absorb energy (a photon of light) When an e- falls back down from excited state to ground state, it releases energy (a photon of light)

  8. Fluorescent and neon lights arecaused by excited e- returning to ground state

  9. Ordinary light is seen by our eyes as a continuous spectrum

  10. The visible light produced by e- falling back to ground state is called a bright line spectrum Light is emitted only at certain wavelengths

  11. Each element has its own distinct bright line spectrum Bright line spectra can be used to identify elements, by comparing the spectral lines to known spectra

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