II. Bohr Model of the Atom (p )

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II. Bohr Model of the Atom (p. 94 - 97) Ch. 4 - Electrons in Atoms II. Bohr Model of the Atom (p. 94 - 97)

A. Line-Emission Spectrum excited state ENERGY IN PHOTON OUT ground state

B. Bohr Model e- exist only in orbits with specific amounts of energy called energy levels Therefore… e- can only gain or lose certain amounts of energy only certain photons are produced

B. Bohr Model 6 Energy of photon depends on the difference in energy levels Bohr’s calculated energies matched the IR, visible, and UV lines for the H atom 5 4 3 2 1

C. Other Elements Helium Each element has a unique bright-line emission spectrum. “Atomic Fingerprint” Helium Bohr’s calculations only worked for hydrogen! 