chapter 4 the bohr model of the atom part 1. visible light
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Niels Bohr
• In 1913 Bohr published a theory about the structure of the atom based on an earlier theory of Rutherford's.
• Bohr expanded upon this theory by proposing that electrons travel only in certain successively larger orbits.
Bohr Model of the Atom
• Electrons orbit the nucleus in orbits that represent specific quantities of energy.
• The energies of the electrons in the atom are quantized.
• Only certain electron orbits (energy levels) are allowed.The Bohr Atom
Niels Bohr
• Bohr also described the way atoms emit radiation by suggesting that when an electron jumps from an outer orbit to an inner one, that it emits light.
Describe the process that occurs inside atoms that produces the spectra?
• Energy is absorbed by the atom.• The electrons jump into higher orbits and the
atom becomes “excited”.• The electrons return to their original orbits
and the atom returns to the ground state.• The electrons release energy in the form of
visible light.• The specific energies (wavelengths,
frequencies) of visible light absorbed and released produce the spectra.
Northern lights (Aurora’s) are one of nature's most beautiful manifestations of the ability of electrons to jump between
quantum states
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